275;IfcPresentableText;"<EPM-HTML>

<p><i>IfcPresentableText</i> is a text string used to capture the content of a text literal for the purpose of presentation. The <i>IfcPresentableText</i> can include multiple lines of text, for which the line feed character LF, 0x0A, should be used to separate lines.</p>

<blockquote class=""note"">
NOTE&nbsp; The non printable characters are converted within the standard exchange format ISO 10303-21 (STEP physical file format), commonly the \X\09 represents the TAB, and \X\0A the LF character.
</blockquote>

<blockquote class=""note"">
NOTE&nbsp; The <i>IfcPresentableText</i> is an entity that had been adopted from ISO 10303, Industrial automation systems and integration&mdash;Product data representation and exchange, Part 46: Integrated generic resources: Visual presentation.</font></p>
</blockquote>

<blockquote class=""note"">
NOTE&nbsp; Corresponding ISO 10303 name: presentable_text. Please refer to ISO/IS 10303-46:1994, p. 133 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x2.
</blockquote>

</EPM-HTML>"
299;IfcTextFontName;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: The value is a font family name and/or generic family name. Values are:</p>
<dl>
  <dt><strong>&lt;family-name&gt;</strong></dt>
  <dd>The name of a font family of choice. For example, ""gill"" and ""helvetica"" are font families.</dd>
  <dt><strong>&lt;generic-family&gt;</strong></dt>
  <dd>In the example above, the last value is a generic family name. The following generic families are defined:
    <ul>
      <li>'serif' (Example: Times)</li>
      <li>'sans-serif' (Example: Helvetica)</li>
      <li>'cursive' (Example: Zapf-Chancery)</li>
      <li>'fantasy' (Example: Western)</li>
      <li>'monospace' (Example: Courier)</li>
    </ul>
  </dd>
</dl>
<p>It is encouraged to offer a generic font family as a last alternative.</p>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definitions are font-family.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x2 Addendum 2.
</blockquote>

<blockquote class=""change-ifc2x2"">
IFC2x2 Addendum 2 CHANGE: The <i>IfcFontFamily</i> has been added.
</blockquote>

</EPM-HTML>"
300;IfcFontStyle;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: The font-style property selects between normal (sometimes
referred to as ""roman"" or ""upright""), italic and oblique faces within a font family. Values are:</p>
<ul>
  <li>normal </li>
  <li>italic </li>
  <li>oblique</li>
</ul>

<p>A value of 'normal' selects a font that is classified as 'normal' in the user agents font database, while 'oblique' selects a font that is labeled 'oblique'. A value of 'italic' selects a font that is labeled 'italic', or, if that is not available, one labeled 'oblique'. The font that is labeled 'oblique' in the user agents font database may actually have been generated by electronically slanting a normal font.
</p>

<p>Fonts with Oblique, Slanted or Incline in their names will typically be labeled 'oblique' in the user agents font database. Fonts with <em>Italic, Cursive</em> or <em>Kursiv</em> in their names will typically be labeled 'italic'.
</p>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definitions is font-style.</font>
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x3.
</blockquote>

</EPM-HTML>"
302;IfcFontVariant;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: The font-style property selects between normal and small-caps within a font family. Values are:</p>
<ul>
  <li>normal </li>
  <li>small-caps </li>
</ul>

<p>Another type of variation within a font family is the small-caps. In a small-caps font the lower case letters look similar to the uppercase ones, but in a smaller size and with slightly different proportions. The 'font-variant' property selects that font.</p>

<p>A value of 'normal' selects a font that is not a small-caps font, 'small-caps' selects a small-caps font. It is acceptable (but not required) in CSS1 if the small-caps font is a created by taking a normal font and replacing the lower case letters by scaled uppercase characters. As a last resort, uppercase letters will be used as replacement for a small-caps font.
</p>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definitions is font-variant.</font>
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x3.
</blockquote>

</EPM-HTML>"
304;IfcFontWeight;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: The 'font-weight' property selects the weight of the font. The values '100' to '900' form an ordered sequence, where each number indicates a weight that is at least as dark as its predecessor. The keyword 'normal' is synonymous with '400', and 'bold' is synonymous with '700'. Keywords other than 'normal' and 'bold' have been shown to be often confused with font names and a numerical scale was therefore chosen for the 9-value list. Values are:</p>

<ul>
  <li>normal </li>
  <li>bold </li>
  <li>100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900</li>
</ul>

<p>Fonts (the font data) typically have one or more properties whose values are names that are descriptive of the ""weight"" of a font. There is no accepted, universal meaning to these weight names. Their primary role is to distinguish faces of differing darkness within a single font family. Usage across font families is quite variant; for example a font that you might think of as being bold might be described as being <em>Regular, Roman, Book, Medium, Semi-</em> or <em>DemiBold, Bold,</em> or <em>Black,</em> depending on how black the ""normal"" face of the font is within the design. Because there is no standard usage of names, the weight property values in CSS1 are given on a numerical scale in which the value '400' (or 'normal') corresponds to the ""normal"" text face for that family. The weight name associated with that face will typically be <em>Book, Regular, Roman, Normal</em> or sometimes <em>Medium</em>.</p>

<p>The association of other weights within a family to the numerical weight values is intended only to preserve the ordering of darkness within that family. However, the following heuristics tell how the assignment is done in typical cases:</p>
<ul>
  <li>If the font family already uses a numerical scale with nine values (such as with <em>OpenType</em>), the font weights should be mapped directly. </li>
  <li>If there is both a face labeled <em>Medium</em> and one labeled <em>Book, Regular, Roman</em> or <em>Normal,</em> then the <em>Medium</em> is normally assigned to the '500'. </li>
  <li>The font labeled ""Bold"" will often correspond to the weight value '700'. </li>
  <li>If there are fewer then 9 weights in the family, the default algorithm for filling the ""holes"" is as follows. If '500' is unassigned, it will be assigned the same font as '400'. If any of the values '600', '700', '800' or '900' remains unassigned, they are assigned to the same face as the next darker assigned keyword, if any, or the next lighter one otherwise. If any of '300', '200' or '100' remains unassigned, it is assigned to the next lighter assigned keyword, if any, or the next darker otherwise. </li>
</ul>

<p>The following two examples illustrate the process. Assume four weights in the ""Example1"" family, from lightest to darkest: <em>Regular, Medium, Bold, Heavy.</em> And assume six weights in the ""Example2"" family: <em>Book, Medium, Bold, Heavy, Black, ExtraBlack.</em> Note how in the second example it has been decided <em>not</em> to assign ""Example2 ExtraBlack"" to anything.
</p>

<pre>Available faces       | Assignments   | Filling the holes<br>----------------------+---------------+-------------------<br>""Example1 Regular""    | 400           | 100, 200, 300<br>""Example1 Medium""     | 500           |<br>""Example1 Bold""       | 700           | 600<br>""Example1 Heavy""      | 800           | 900<br></pre>
<pre>Available faces       | Assignments   | Filling the holes<br>----------------------+---------------+-------------------<br>""Example2 Book""       | 400           | 100, 200, 300<br>""Example2 Medium""     | 500           |<br>""Example2 Bold""       | 700           | 600 <br>""Example2 Heavy""      | 800           |<br>""Example2 Black""      | 900           |<br>""Example2 ExtraBlack"" | (none)        |<br></pre>
<br>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definitions is font-weight.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x2 Addendum 2.
</blockquote>

</EPM-HTML>"
3764;IfcURIReference;"<EPM-HTML> 

<p><em>IfcURIReference</em> provides for identifying a Uniform Resource Identifier, URI, as defined by the RFC3986 of the Network Working Group. A URI can be classified as a locator or a name or both, that is it may comprise a Uniform Resource Locator (URL) and/or a Uniform Resource Name (URN).</p>
<ul>
<li>A Uniform Resource Locator, URL, is a string conforming to a standardized format, which refers to a resource on the internet (such as a document or an image) by its location.</li>
<li>A Uniform Resource Name, URN, is intended to serve as persistent, location-independent resource identifier and is
designed to make it easy to map other namespaces (that share the properties of URNs) into URN-space.</li>
</ul>

<blockquote class=""history"">
HISTORY New defined datatype in IFC 2x4.
</blockquote>

</EPM-HTML>"
3869;IfcLanguageId;"<EPM-HTML> 
<p><em>IfcLanguageId</em> identifies the language in which a natural language text is expressed. It uses a language tag to identify the language.</p>
<p>The tag shall comply to the Internet Engineering Task Force (IETF) language tag as expressed in RFC 5646. A conforming program shall support the ""simple language"" subtag and the ""language-region"" tag format.</p>

<blockquote class=""example"">
EXAMPLE&nbsp; for simple language tags en (English), de (German), fr (France), or ja (Japanese), and for language-region tags en-US (English as used in United States), de-CH (German as used in German speaking part of Switzerland).
</blockquote>

<p>Type: <em>IfcIdentifier</em></p>

<blockquote class=""note"">
NOTE&nbsp; The use of <em>IfcLanguageId</em> should conform to the use of language tags in HTML and XML as published by the W3C consortium.
</blockquote>
<blockquote class=""history"">
HISTORY&nbsp; New defined datatype in IFC2x4.
</blockquote>

</EPM-HTML>"
4001;IfcDateTime;"<epm-html> 
    <p>
      This lexical representation is the [ISO 8601] extended
      format CCYY-MM-DDThh:mm:ss where ""CC"" represents the
      century, ""YY"" the year, ""MM"" the month and ""DD"" the day,
      preceded by an optional leading ""-"" sign to indicate a
      negative number. If the sign is omitted, ""+"" is assumed.
      The letter ""T"" is the date/time separator and ""hh"", ""mm"",
      ""ss"" represent hour, minute and second respectively.
      Additional digits can be used to increase the precision of
      fractional seconds if desired i.e the format ss.ss... with
      any number of digits after the decimal point is supported.
      The fractional seconds part is optional; other parts of the
      lexical form are not optional. To accommodate year values
      greater than 9999 additional digits can be added to the
      left of this representation. Leading zeros are required if
      the year value would otherwise have fewer than four digits;
      otherwise they are forbidden. The year 0000 is prohibited.
    </p>
    <blockquote class=""history"">HISTORY: New type in IFC2x4</blockquote>
</epm-html>"
4002;IfcDate;"<epm-html> 

<p>The lexical representation for date is the reduced (right truncated) lexical representation for dateTime: CCYY-MM-DD. No left truncation is allowed. An optional following time zone qualifier is allowed as for dateTime. To accommodate year values outside the range from 0001 to 9999, additional digits can be added to the left of this representation and a preceding ""-"" sign is allowed.</p>

<blockquote class=""history"">HISTORY: New type in IFC2x4</blockquote>

<p class=""head-use"">Use definitions</p>
<p>All given values should be provided in context and converted into a Gregorian date context and be shall be processable by a receiving application.</p>

</epm-html>"
4003;IfcTime;"<epm-html> 
    <p>
      The lexical representation for time is the left truncated
      lexical representation for dateTime: hh:mm:ss.sss with
      optional following time zone indicator. For example, to
      indicate 1:20 pm for Eastern Standard Time which is 5 hours
      behind Coordinated Universal Time (UTC), one would write:
      13:20:00-05:00.
    </p>
    <blockquote class=""history"">HISTORY: New type in IFC2x4</blockquote>
</epm-html>"
4004;IfcDuration;"<epm-html> 

<p>String representation of a time duration according to ISO8601:2000 <i>""Data elements and interchange formats - Information interchange - Representation of dates and times""</i> as defined in section 5.5.3 <i>""Representation of duration""</i>.<br>
It is recommended to use the alternative format (section 5.5.4.2.2) in its extended version: PYYYY-MM-DDThh:mm:ss.<br>
EXAMPLE: P0002-10-15T10:30:20 (duration of two years, 10 months, 15 days, 10 hours, 30 minutes and 20 seconds).</p>

<blockquote class=""history"">HISTORY: New type in IFC2x4</blockquote>

</epm-html>"
4122;IfcDayInMonthNumber;"<EPM-HTML>
<p><u>Definition from IAI</u>: The <i>IfcDayInMonthNumber</i> is
an integer that defines the position of the specified day in a
month.</p>
<p>Type: INTEGER</p>
<blockquote><small><font color=""#0000FF"">NOTE Corresponding STEP
name: day_in_month_number, please refer to ISO/IS 10303-41:1994
for the final definition of the formal
standard.</font></small></blockquote>
<blockquote><small><font color=""#0000FF"">HISTORY New type in IFC
Release 1.5.1.</font></small><br>
<small><font color=""#FF0000"">IFC2x4 CHANGE Where rule
<i>ValidRange</i> added.</font></small></blockquote>
</EPM-HTML>"
4124;IfcDayInWeekNumber;"<EPM-HTML>
<p><u>Definition from IAI</u>: The <i>IfcDayInWeekNumber</i> is
an integer that defines the position of the specified day in a
week. The positions have the following meaning (according to
ISO8601 ""the calendar week"") that assigns the ordinal day number
in the week to the Calender day name.</p>
<table border=""0"" cellpadding=""2"" cellspacing=""2"" summary=
""Calender days"">
<thead>
<tr valign=""top"">
<td width=""90""><b>Ordinal day number</b></td>
<td><b>Calendar day<br>
name</b></td>
</tr>
</thead>
<tbody>
<tr valign=""top"">
<td>01</td>
<td>Monday</td>
</tr>
<tr valign=""top"">
<td>02</td>
<td>Tuesday</td>
</tr>
<tr valign=""top"">
<td>03</td>
<td>Wednesday</td>
</tr>
<tr valign=""top"">
<td>04</td>
<td>Thursday</td>
</tr>
<tr valign=""top"">
<td>05</td>
<td>Friday</td>
</tr>
<tr valign=""top"">
<td>06</td>
<td>Saturday</td>
</tr>
<tr valign=""top"">
<td>07</td>
<td>Sunday</td>
</tr>
</tbody>
</table>
<p>Type: INTEGER</p>
<blockquote><small><font color=""#0000FF"">HISTORY New type in
IFC2x4.</font></small></blockquote>
</EPM-HTML>"
4126;IfcMonthInYearNumber;"<EPM-HTML>
<p><u>Definition from IAI</u>: The <i>IfcDayInMonthNumber</i> is
an integer that defines the position of the specified month in a
year. The positions have the following meaning (according to
ISO8601 ""calendar month"") that assigns the Calendar month number
to the Calender month name.</p>
<blockquote><small>NOTE Refer to ISO 8601 for the definitions for
using the Gregorian calendar as the standard for the
identification of calendar days.</small></blockquote>
<table border=""0"" cellpadding=""2"" cellspacing=""2"" summary=
""Calender days"">
<thead>
<tr valign=""top"">
<td width=""100""><b>Calendar month number</b></td>
<td><b>Calendar month<br>
name</b></td>
</tr>
</thead>
<tbody>
<tr valign=""top"">
<td>01</td>
<td>January</td>
</tr>
<tr valign=""top"">
<td>02</td>
<td>February</td>
</tr>
<tr valign=""top"">
<td>03</td>
<td>March</td>
</tr>
<tr valign=""top"">
<td>04</td>
<td>April</td>
</tr>
<tr valign=""top"">
<td>05</td>
<td>May</td>
</tr>
<tr valign=""top"">
<td>06</td>
<td>June</td>
</tr>
<tr valign=""top"">
<td>07</td>
<td>July</td>
</tr>
<tr valign=""top"">
<td>08</td>
<td>August</td>
</tr>
<tr valign=""top"">
<td>09</td>
<td>September</td>
</tr>
<tr valign=""top"">
<td>10</td>
<td>October</td>
</tr>
<tr valign=""top"">
<td>11</td>
<td>November</td>
</tr>
<tr valign=""top"">
<td>12</td>
<td>December</td>
</tr>
</tbody>
</table>
<p>Type: INTEGER</p>
<blockquote><small><font color=""#0000FF"">NOTE Corresponding STEP
name: month_in_year_number, please refer to ISO/IS 10303-41:1994
for the final definition of the formal
standard.</font></small></blockquote>
<blockquote><small><font color=""#0000FF"">HISTORY New type in IFC
Release 1.5.1.</font></small></blockquote>
</EPM-HTML>"
4298;IfcCardinalPointReference;"<EPM-HTML> 
<p>An <i>IfcCardinalPointReference</i> is an index reference to
significant points of a section profile. This index is used to
describe the spatial relationship between the section of a member
and a reference axis of the same member.</p>

<blockquote class=""history"">
HISTORY  New Type in IFC2x4.
</blockquote>

<p>Indexes 1...9 refer to points at the bounding box of a
profile. Indexes 10...19 refer to points defined by geometric
centroid (usually centre of gravity) and shear centre, and their
combinations with bounding box coordinates. In particular, the
following index values are specified in this IFC Release:</p>
<ol>
<li>bottom left</li>
<li>bottom centre</li>
<li>bottom right</li>
<li>mid-depth left</li>
<li>mid-depth centre</li>
<li>mid-depth right</li>
<li>top left</li>
<li>top centre</li>
<li>top right</li>
<li>geometric centroid</li>
<li>bottom in line with the geometric centroid</li>
<li>left in line with the geometric centroid</li>
<li>right in line with the geometric centroid</li>
<li>top in line with the geometric centroid</li>
<li>shear centre</li>
<li>bottom in line with the shear centre</li>
<li>left in line with the shear centre</li>
<li>right in line with the shear centre</li>
<li>top in line with the shear centre</li>
</ol>
<p>Other index values are possible but outside the scope of this
specification.</p>

<p>Figure 283 illustrates cardinal point values.</p>
<table>
<tr><td><img src=""figures/IfcCardinalPointReference-01.png"" alt=""arbitrary profile with cardinal points"" border=""0"" width=""676""height=""264""></td></tr>
<tr><td><p class=""figure"">Figure 283 &mdash; Cardinal point values</p></td></tr>
</table>

<p>Figure 284 illustrates an example extrusion shape with arbitrary profile (<i>IfcArbitraryClosedProfileDef</i>), aligned ""mid-depth right"" on the member axis. The line of sight follows the extrusion direction Z which points into the drawing plane of above illustration. Hence, ""left"" is in the positive X direction of the <i>IfcProfileDef</i>. ""Top"" is in the positive Y direction of the <i>IfcProfileDef</i>.</p>

<table>
<tr><td><img src=""figures/IfcCardinalPointReference-02.png"" alt=""extrusion shape with arbitrary profile and alignment"" border=""0"" width=""357"" height=""236""></td></tr>
<tr><td><p class=""figure"">Figure 284 &mdash; Cardinal point extrusion</p></td></tr>
</table>

</EPM-HTML>"
4311;IfcAmountOfSubstanceMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: An amount of substance measure is the value for the quantity  of a substance when compared with the number of atoms in 0.012kilogram of carbon 12.</p>

<p>Usually measure in mole (mol).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: amount_of_substance_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4312;IfcAngularVelocityMeasure;"<EPM-HTML>

<p><i>IfcAngularVelocityMeasure</i> is a measure of the velocity of a body measured in terms of angle subtended per unit time.</p>
<p>Usually measured in radians/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML> 

 
"
4313;IfcAreaMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: An area measure is the value of the extent of a surface.</p>
<p>Usually measured in square metre (m2).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: area_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4314;IfcBoolean;"<EPM-HTML>

<p><i>IfcBoolean</i> is a defined data type of simple data type Boolean. It is required since a select type (<I>IfcSimpleValue</I>) cannot directly include simple types in its select list.  A boolean type can have value TRUE or FALSE.</p>

<p>Type: BOOLEAN</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>


"
4315;IfcCompoundPlaneAngleMeasure;"<EPM-HTML>

<p><i>IfcCompoundPlaneAngleMeasure</i> is a compound measure of plane angle in degrees, minutes, seconds, and optionally millionth-seconds of arc.</p>

<blockquote class=""note"">
NOTE: <i>IfcCompoundPlaneAngleMeasure</i> is used where angles need to be described to an accuracy as fine as one millionth of a degree and expressed as parts of an arc. It may be used for angular measurement by surveyors or for other angular measurements where precision is required. Another usage is exact or approximate global positioning against a geographic coordinate systems using longitude and latitude.
</blockquote>

<blockquote class=""note"">
NOTE: While the unit of measurement of the type <i>IfcPlaneAngleMeasure</i> depends on unit assignment (radian or degree or other derived units; globally at the <i>IfcPoject</i> or locally at an <i>IfcMeasureWithUnit</i>), the units of <i>IfcCompoundPlaneAngleMeasure</i> are always degrees, minutes, seconds, and millionth-seconds irrespective of unit assignments.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

<p>Type: LIST [3:4] OF INTEGER</p>

<p><b>Value restrictions</b></p>

<ul>
<li>The first integer measure is the number of degrees and is generally not range-restricted.  However, when <i>IfcCompoundPlaneAngleMeasure</i> is used to express geographic coordinates, only latitudes of [-90, 90] and longitudes of [-180, 180] are used in practice.</li>
<li>The second integer measure is the number of minutes and shall be in the range (-60, 60).</li>
<li>The third integer measure is the number of seconds and shall be in the range (-60, 60).</li>
<li>The optional fourth integer measure is the number of millionth-seconds and shall be in the range (-1 000 000, 1 000 000).</li>
</ul>

<p><b>Signedness</b></p>

<p>All measure components have the same sign (positive or negative).  It is therefore trivial to convert between floating point representation (decimal degrees) and compound representation regardless whether the angle is greater or smaller than zero.  Example:</p>

<blockquote><code>
LOCAL<br>
&nbsp;&nbsp;a : IfcPlaneAngleMeasure := -50.975864; &nbsp;(* decimal degrees, -50&deg; 58' 33&quot; 110400 *)<br>
&nbsp;&nbsp;b : IfcPlaneAngleMeasure;<br>
&nbsp;&nbsp;c : IfcCompoundPlaneAngleMeasure;<br>
&nbsp;&nbsp;s : IfcText;<br>
END_LOCAL;<br>
<br>
(* convert from float to compound *)<br>
&nbsp;&nbsp;c[1] := &nbsp;&nbsp;&nbsp;a; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-- -50<br>
&nbsp;&nbsp;c[2] := &nbsp;&nbsp;(a - c[1]) * 60; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-- -58<br>
&nbsp;&nbsp;c[3] := &nbsp;((a - c[1]) * 60 - c[2]) * 60; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-- -33<br>
&nbsp;&nbsp;c[4] := (((a - c[1]) * 60 - c[2]) * 60 - c[3]) * 1.e6; &nbsp;-- -110400<br>
<br>
(* convert from compound to float *)<br>
&nbsp;&nbsp;b := c[1] + c[2]/60. + c[3]/3600. + c[4]/3600.e6; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-- -50.975864<br>
</code></blockquote>

<p><b>Use in string representations</b></p>

<p>When a compound plane angle measure is formatted for display or printout, the signs of the fractional components will usually be discarded because, to a human reader, the sign of the first component alone already indicates the sense of the angle:</p>

<blockquote><code>
(* convert from compound to human-readable string *)<br>
&nbsp;&nbsp;s := FORMAT(c[1], '+##') &nbsp;&nbsp;&nbsp;&nbsp;+ &quot;000000B0&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+ FORMAT(ABS(c[2]), '##') + ''''<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+ FORMAT(ABS(c[3]), '##') + '&quot;'<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+ FORMAT(ABS(c[4]), '##'); &nbsp;-- -50&deg; 58' 33&quot; 110400
</code></blockquote>

<p>Another often encountered display format of latitudes and longitudes is to omit the signs and print N, S, E, W indicators instead, for example, <code>50&deg;58'33&quot;S</code>.  When stored as <i>IfcCompoundPlaneAngleMeasure</i> however, a compound plane angle measure is always signed, with same sign of all components.</p>

</EPM-HTML>"
4321;IfcContextDependentMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: Is the value of a physical quantity as defined by an application context.</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: context_dependent_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4322;IfcCountMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A count measure is the value of a count.</p>
<p>Type: NUMBER</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: count_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>
"
4323;IfcDescriptiveMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A descriptive measure is a human interpretable definition of a quantifiable value.</p>
<p>Type: STRING</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name:descriptive_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>
"
4324;IfcDynamicViscosityMeasure;"<EPM-HTML>

<p><i>IfcDynamicViscosityMeasure</i> is a measure of the viscous resistance of a medium.</p>

<p>Usually measured in Pascal second (Pa s).</p>
<p>Type: REAL </p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4325;IfcElectricCurrentMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: The value for the movement of electrically charged particles.</p>
<p>Usually measured in Ampere (A).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: electric_current_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4326;IfcElectricVoltageMeasure;"<EPM-HTML>

<p><i>IfcElectricVoltageMeasure</i> is a measure of electromotive force.</p>
<p>Usually measured in Volts (V, W/A).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4327;IfcEnergyMeasure;"<EPM-HTML>

<p><i>IfcEnergyMeasure</i> is a measure of energy required or used.</p>
<p>Usually measured in Joules, (J, Nm).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>
"
4328;IfcFrequencyMeasure;"<EPM-HTML>

<p><i>IfcFrequencyMeasure</i> is a measure of the number of times that an item vibrates in unit time.</p>
<p>Usually measured in cycles/s or Herz (Hz).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4329;IfcHeatFluxDensityMeasure;"<EPM-HTML>

<p>IfcHeatFluxDensityMeasure</i> is a measure of the density of heat flux within a body.</p>
<p>Usually measured in W/m2 (J/s m2).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>


"
4330;IfcInteger;"<EPM-HTML>

<p><i>IfcInteger</i> is a defined type of simple data type Integer. It is required since a select type (<I>IfcSimpleValue</I>) cannot include directly simple types in its select list.</p>

<p>In principle, the domain of <I>IfcInteger</I> (being an Integer) is all integer numbers. Here the number of bits used for the <i>IfcInteger</i> representation is unconstrained, but in practice it is implementation specific.</p>

<p>Type: INTEGER</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4331;IfcIntegerCountRateMeasure;"<EPM-HTML>

<p><i>IfcIntegerCountRateMeasure</i> is a measure of the integer number of units flowing per unit time.</p>

<blockquote class=""example"">
EXAMPLE: This measure may be used for measuring integer units per second or per hour. For example, it may be used to measure the number of books per hour passing along a part of a mechanical book handling system, the number of people per hour travelling along a moving walkway or the number of vehicles per hour travelling along a section of road.
</blockquote>

<p>Type: INTEGER</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>
"
4332;IfcKinematicViscosityMeasure;"<EPM-HTML>

<p><i>IfcKinematicViscosityMeasure</i> is a measure of the viscous resistance of a medium to a moving body.</p>
<p>Usually measured in m2/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>

 
"
4333;IfcLengthMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A length measure is the value of a distance.</p>
<p>Usually measured in millimeters (mm).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: length_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4334;IfcLinearVelocityMeasure;"<EPM-HTML>

<p><i>IfcLinearVelocityMeasure</i> is a measure of the velocity of a body measured in terms of distance moved per unit time.</p>
<p>Usually measured in m/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>

"
4335;IfcLuminousIntensityMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A luminous intensity measure is the value for the brightness of a body.</p>
<p>Usually measured in candela (cd).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: luminous_intensity_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4336;IfcMassDensityMeasure;"<EPM-HTML>

<p><i>IfcMassDensityMeasure</i> is a measure of the density of a medium.</p>
<p>Usually measured in kg/m3.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>

"
4337;IfcMassFlowRateMeasure;"<EPM-HTML>

<p><i>IfcMassFlowRateMeasure</i> is a measure of the mass of a medium flowing per unit time.</p>
<p>Usually measured in kg/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>
"
4338;IfcMassMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A mass measure is the value of the amount of matter that a body contains.</p>
<p>Usually measured in kilograms (kg) or grams (g).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: mass_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4339;IfcMonetaryMeasure;"<EPM-HTML>

<p>A monetary measure is the value of an amount of money without regard to its currency.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4340;IfcNumericMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A numeric measure is the numeric value of a physical quantity.</p>
<p>Type: NUMBER</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: numeric_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

<EPM-HTML>
"
4341;IfcParameterValue;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A parameter value is the value which specifies the amount of a 
parameter in some parameter space.</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding STEP name: parameter_value, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4342;IfcPlaneAngleMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A plane angle measure is the value of an angle in a plane.

<p>Usually measured in radian (rad, m/m = 1), but also grads may be used. The grad unit may be declared as a conversion based unit based on radian unit.</p>

<blockquote class=""note"">
NOTE <I>IfcPlaneAngleMeasure</I> is used where angles need to be described to an accuracy of less than one degree and expressed as decimal parts of an angle. It is widely used for angular measurement except for situations where accuracy needs to be defined using arc measurement; for which purpose the <I>IfcCompoundPlaneAngleMeasure</I> is provided.
</blockquote>

<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: plane_angle_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4343;IfcPositiveLengthMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A positive length measure is a length measure that is greater than zero.</p>
<p>Type: <i>IfcLengthMeasure</i></p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: positive_length_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4345;IfcPositivePlaneAngleMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: Positive plane angle measure is a plane angle measure that is greater than zero.</p>
<p>Type: <i>IfcPlaneAngleMeasure</i></p> 

<blockquote class=""note"">
NOTE Corresponding STEP name: positive_plane_angle_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4347;IfcPositiveRatioMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A positive ratio measure is a ratio measure that is greater than zero.</p>
<p>Type: <i>IfcRatioMeasure</i></p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: positive_ratio_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

<EPM-HTML>"
4349;IfcRatioMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A ratio measure is the value of the relation between two 
physical quantities that are of the same kind.</p>

<blockquote class=""note"">
NOTE: Input given in percent is to be divided by 100% when stored as an IfcRatioMeasure. For example, 25% becomes 0.25.
</blockquote>

<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding STEP name: ratio_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4350;IfcPowerMeasure;"<EPM-HTML>

<p><i>IfcPowerMeasure</i> is a measure of power required or used.</p>
<p>Usually measured in Watts (W, J/s).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>

"
4351;IfcPressureMeasure;"<EPM-HTML>

<p><i>IfcPressureMeasure</i> is a measure of the quantity of a medium acting on a unit area.</p>
<p>Usually measured in Pascals (Pa, N/m2).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4352;IfcReal;"<EPM-HTML>

<p><i>IfcReal</i> is a defined type of simple data type REAL.  It is required since a select type (<i>IfcSimpleValue</i>), cannot directly include simple types in its select list.</p>

<p>In principle, the domain of <i>IfcReal</i> (being a Real) is all rational, irrational and scientific real numbers. Here the precision is unconstrained, but in practice it is implementation specific.</p>

<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY: New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4353;IfcSolidAngleMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A solid angle measure is the value of an angle in a solid.</p>
<p>Usually measured in Steradians, (sr, m2/m2).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: solid_angle_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4354;IfcIdentifier;"<EPM-HTML>
<p><u>Definition from ISO/CD 10303-41:1992</u>: An identifier is an alphanumeric string which allows an individual thing to be identified. It may not provide natural-language meaning.</p>

<p>Type: STRING of up to 255 characters</p>

<blockquote><font size=""-1"">NOTE Corresponding STEP name: identifier, please refer to ISO/IS 10303-41 for the final definition of the formal standard.</font></blockquote>

<blockquote><font size=""-1"" color=""#0000ff"">HISTORY New type in IFC Release 2x.<br>
IFC 2x4 CHANGE: Previously recommended size restriction of 255 characters is now mandatory.</font></blockquote>

<p>As a merely machine-readable string for identification purposes, an identifier is usually machine-generated and locale-independent (in contrast to human-readable labels, <i>IfcLabel</i>).</p>

<p>Per ISO 10303-11, the set of characters that may appear in STRINGs is defined in ISO 10646.  The encoding of characters in case of file-based exchange is defined in ISO 10303-21 (STEP physical files) and ISO 10303-28 (XML files).  Among else, these specifications define the encoding of 8-bit characters from ISO 8859-1...-16 and of 2-byte Unicode characters.</p>

<p>Note that while <i>IfcIdentifier</i> is restricted to 255 characters, the size in exchange files after encoding may be considerably larger than 255 octets, depending on the particular encoding and on the contents of the identifier.</p>

</EPM-HTML>"
4355;IfcThermalAdmittanceMeasure;"<EPM-HTML>

<p><i>IfcThermalAdmittanceMeasure</i> is the measure of the ability of a surface to smooth out temperature variations.</p>
<p>Usually measured in Watt / m2 Kelvin.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4356;IfcThermalResistanceMeasure;"<EPM-HTML>

<p><i>IfcThermalResistanceMeasure</i> is a measure of the resistance offered by a body to the flow of energy.</p>
<p>Usually measured in m2 Kelvin/Watt.</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4357;IfcThermalTransmittanceMeasure;"<EPM-HTML>

<p><i>IfcThermalTransmittanceMeasure</i> is a measure of the rate at which energy is transmitted through a body.</p>
<p>Usually measured in Watts/m2 Kelvin.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>"
4358;IfcThermodynamicTemperatureMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A thermodynamic temperature measure is the value for the degree of heat of a body.</p>
<p>Usually measured in degrees Kelvin (K).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: thermodynamic_temperature_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>

"
4359;IfcTimeMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A time measure is the value of the duration of periods.</p>
<p>Measured in seconds (s) or days (d) or other units of time.</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: time_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote>
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4360;IfcTimeStamp;"<EPM-HTML>

<p><i>IfcTimeStamp</i> is an indication of date and time by measuring the number of seconds which have elapsed since the beginning of the year 1970.</p>
<p>Type: INTEGER</p>

<blockquote class=""history"">
  HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>
"
4361;IfcVolumeMeasure;"<EPM-HTML>

<p><u>Definition from ISO/CD 10303-41:1992</u>: A volume measure is the value of the solid content of a body.</p>
<p>Usually measured in cubic metre (m3).</p>
<p>Type: REAL</p>

<blockquote class=""note"">
NOTE Corresponding ISO 10303 name: volume_measure, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class=""history"">
HISTORY New type in IFC Release 1.5.1.
</blockquote>

</EPM-HTML>"
4362;IfcVolumetricFlowRateMeasure;"<EPM-HTML>

<p><i>IfcVolumetricFlowRateMeasure</i> is a measure of the volume of a medium flowing per unit time.</p>
<p>Usually measured in m3/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2.0.
</blockquote>

</EPM-HTML>
"
4387;IfcLabel;"<EPM-HTML>
<p><u>Definition from ISO/CD 10303-41:1992</u>: A label is the term by which something may be referred to.  It is a string which represents the human-interpretable name of something and shall have a natural-language meaning.</p>

<p>Type: STRING of up to 255 characters</p>

<blockquote><font size=""-1"">NOTE Corresponding STEP name: label, please refer to ISO/IS 10303-41 for the final definition of the formal standard.</font></blockquote>

<blockquote><font size=""-1"" color=""#0000ff"">HISTORY New type in IFC Release 2x.<br>
IFC 2x4 CHANGE: Previously recommended size restriction of 255 characters is now mandatory.</font></blockquote>

<p>As a human-readable string for naming purposes, a label is usually human-specified and locale-dependent (in contrast to purely machine-readable identifiers, <i>IfcIdentifier</i>).</p>

<p>Per ISO 10303-11, the set of characters that may appear in STRINGs is defined in ISO 10646.  The encoding of characters in case of file-based exchange is defined in ISO 10303-21 (STEP physical files) and ISO 10303-28 (XML files).  Among else, these specifications define the encoding of 8-bit characters from ISO 8859-1...-16 and of 2-byte Unicode characters.</p>

<p>Note that while <i>IfcLabel</i> is restricted to 255 characters, the size in exchange files after encoding may be considerably larger than 255 octets, depending on the particular encoding and on the contents of the label.</p>

</EPM-HTML>"
4426;IfcNormalisedRatioMeasure;"<EPM-HTML>

<p><i>IfcNormalisedRatioMeasure</i> is a dimensionless measure to express ratio values ranging from 0.0 to 1.0.</p>

<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4428;IfcComplexNumber;"<EPM-HTML>

<p><i>IfcComplexNumber</i> is a representation of a complex number expressed as an array with two elements.
  The first element (index 1) denotes the real component which is the numerical
  component of a complex number whose square roots can be calculated explicitly.
  The second element (index 2) denotes the imaginary component which is the numerical
  component of a complex number whose square roots cannot be determined other
  than through the provision of the square of the imaginary number j where j^2 = -1.
  Note that the imaginary component may be referred to as i in certain references.
</p>

<p>
  Type: ARRAY [1:2] OF REAL
</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x2.
</blockquote>

</EPM-HTML>
"
4430;IfcNonNegativeLengthMeasure;"<EPM-HTML>

<p>A non-negative length measure is a length measure that is greater than or equal to zero.</p>

<p>Type: <i>IfcLengthMeasure</i></p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x4.
</blockquote>

</EPM-HTML>"
4444;IfcText;"<EPM-HTML>
<p><u>Definition from ISO/CD 10303-41:1992</u>: A text is an alphanumeric string of characters which is intended to be read and understood by a human being. It is for information purposes only.</p>

<p>Type: STRING</p>

<blockquote><font size=""-1"">NOTE Corresponding STEP name: text, please refer to ISO/IS 10303-41 for the final definition of the formal standard.</font></blockquote>

<blockquote><font size=""-1"" color=""#0000ff"">HISTORY New type in IFC Release 2x.</font></blockquote>

<p>Per ISO 10303-11, the set of characters that may appear in STRINGs is defined in ISO 10646.  The encoding of characters in case of file-based exchange is defined in ISO 10303-21 (STEP physical files) and ISO 10303-28 (XML files).  Among else, these specifications define the encoding of 8-bit characters from ISO 8859-1...-16 and of 2-byte Unicode characters.</p>

<p>Note that while <i>IfcText</i> is not formally restricted in length, the size of a string in ISO 10303-21:2002 conforming exchange files must not exceed 32767 octets after encoding and escaping.</p>

</EPM-HTML>"
4445;IfcLogical;"<EPM-HTML>

<p><i>IfcLogical</iL is a defined type of simple type Logical. It is required since a select type (<I>IfcSimpleValue</I>) cannot directly include simple types in its select list). Logical datatype can have values TRUE, FALSE or UNKNOWN.</p>

<p>Type: LOGICAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4516;IfcThermalConductivityMeasure;"<EPM-HTML>

<p><i>IfcThermalConductivityMeasure</i> is a measure of thermal conductivity.</p>
<p>Usually measured in Watt / m Kelvin.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4517;IfcMolecularWeightMeasure;"<EPM-HTML>

<p><i>IfcMolecularWeightMeasure</i> is a measure of molecular weight of material (typically gas).</p>
<p>Usually measured in g/mole.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4518;IfcVaporPermeabilityMeasure;"<EPM-HTML>

<p><i>IfcVaporPermeabilityMeasure</i> is a measure of vapor permeability.</p>
<p>Usually measured in kg / s m Pascal.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4519;IfcMoistureDiffusivityMeasure;"<EPM-HTML>

<p><i>IfcMoistureDiffusivityMeasure</i> is a measure of moisture diffusivity.</p>
<p>Usually measured in m3/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4520;IfcIsothermalMoistureCapacityMeasure;"<EPM-HTML>

<p><i>IfcIsothermalMoistureCapacityMeasure</i> is a measure of isothermal moisture capacity.</p>
<p>Usually measured in m3/kg.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4521;IfcSpecificHeatCapacityMeasure;"<EPM-HTML>

<p><i>IfcSpecificHeatCapacityMeasure</i> defines the specific heat of material: The heat energy absorbed per temperature unit.</p>
<p>Usually measured in J / kg Kelvin.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>
"
4522;IfcMagneticFluxDensityMeasure;"<EPM-HTML>

<p><i>IfcMagneticFluxDensityMeasure</i> is a measure of the magnetic flux density.</p>
<p>Usually measured in Tesla (T, Weber/m2 = V s/m2).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4523;IfcMagneticFluxMeasure;"<EPM-HTML>

<p><i>IfcMagneticFluxMeasure</i> is a measure of the magnetic flux.</p>
<p>Usually measured in Weber (Wb, V s).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4524;IfcLuminousFluxMeasure;"<EPM-HTML>

<p><i>IfcLuminousFluxMeasure</i> is a measure of the luminous flux.</p>
<p>Usually measured in Lumen (lm, Candela Steradian).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4525;IfcForceMeasure;"<EPM-HTML>

<p><i>IfcForceMeasure</i> is a measure of the force.</p>
<p>Usually measured in Newton (N, kg m/s2).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4526;IfcInductanceMeasure;"<EPM-HTML>

<p><i>IfcInductanceMeasure</i> is a measure of the inductance.</p>
<p>Usually measure in Henry (H, Weber/A = V s/A).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4527;IfcIlluminanceMeasure;"<EPM-HTML>

<p><i>IfcIlluminanceMeasure</i> is a measure of the illuminance.</p>
<p>Usually measured in Lux (lx, Lumen/m2 = Candela Steradian/m2).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4528;IfcElectricResistanceMeasure;"<EPM-HTML>

<p><i>IfcElectricResistanceMeasure</i> is a measure of the electric resistance.</p>
<p>Usually measured in Ohm (V/A).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4529;IfcElectricConductanceMeasure;"<EPM-HTML>

<p><i>IfcElectricConductanceMeasure</i> is a measure of the electric conductance.</p>
<p>Usually measured in Siemens (S, 1/Ohm = A/V).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4530;IfcElectricChargeMeasure;"<EPM-HTML>

<p><i>IfcElectricChargeMeasure</i> is a measure of the electric charge.</p>
<p>Usually measured in Coulomb (C, A s).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4531;IfcDoseEquivalentMeasure;"<EPM-HTML>

<p><i>IfcDoseEquivalentMeasure</i> is a measure of the radioactive dose equivalent.</p>
<p>Usually measured in Sievert (Sv, J/kg).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4532;IfcElectricCapacitanceMeasure;"<EPM-HTML>

<p><i>IfcElectricCapacitanceMeasure</i> is a measure of the electric capacitance.</p>
<p>Usually measured in Farad (F, C/V = A s/V).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4533;IfcAbsorbedDoseMeasure;"<EPM-HTML>

<p><i>IfcAbsorbedDoseMeasure</i> is a measure of the absorbed radioactivity dose.</p>
<p>Usually measured in Gray (Gy, J/kg).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4534;IfcRadioActivityMeasure;"<EPM-HTML>

<p><i>IfcRadioActivityMeasure</i> is a measure of activity of radionuclide.</p>
<p>Usually measured in Becquerel (Bq, 1/s).</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4535;IfcRotationalFrequencyMeasure;"<EPM-HTML>

<p><i>IfcRotationalFrequencyMeasure</i> is a measure of the number of cycles that an item revolves in unit time.</p>
<p>Usually measured in cycles/s.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>
"
4536;IfcTorqueMeasure;"<EPM-HTML>

<p><i>IfcTorqueMeasure</i> is a measure of the torque or moment of a couple.</p>
<p>Usually measured in N m.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4537;IfcAccelerationMeasure;"<EPM-HTML>

<p><i>IfcAccelerationMeasure</i> is a measure of acceleration.</p>
<p>Usually measured in m/s2.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4538;IfcLinearForceMeasure;"<EPM-HTML>

<p><i>IfcLinearForceMeasure</i> is a measure of linear force.</p>
<p>Usually measured in N/m.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4539;IfcLinearStiffnessMeasure;"<EPM-HTML>

<p><i>IfcLinearStiffnessMeasure</i>A measure of linear stiffness.</p>
<p>Usually measured in N/m.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4540;IfcModulusOfSubgradeReactionMeasure;"<EPM-HTML>

<p><i>IfcModulusOfSubgradeReactionMeasure</i> is a geotechnical measure describing interaction between foundation structures and the soil. May also be known as bedding measure.</p> 
<p> Usually measured in N/m3. </p> 
<p> Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote> 

<p>Figure 290 illustrates elastic support of a planar member.</p>
<table>
<tr><td><img src=""figures/IfcModulusOfSubgradeReactionMeasure.gif"" width=""471"" height=""301"" border=""0""></td></tr>
<tr><td><p class=""figure"">Figure 290 &mdash; Modulus of subgrade reaction measure</p></td></tr>
</table>

</EPM-HTML>"
4541;IfcModulusOfElasticityMeasure;"<EPM-HTML>

<p><i>IfcModulusOfElasticityMeasure</i> is a measure of modulus of elasticity.</p>
<p>Usually measured in N/m2.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4542;IfcMomentOfInertiaMeasure;"<EPM-HTML>

<p><i>IfcMomentOfInertiaMeasure</i> is a measure of moment of inertia.</p>
<p>Usually measured in m4.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4543;IfcPlanarForceMeasure;"<EPM-HTML>

<p><i>IfcPlanarForceMeasure</i> is a measure of force on an area.</p>
<p>Usually measured in N/m2.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4544;IfcRotationalStiffnessMeasure;"<EPM-HTML>

<p><i>IfcRotationalStiffnessMeasure</i> is a measure of rotational stiffness.</p>
<p>Usually measured in Nm/rad.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4545;IfcShearModulusMeasure;"<EPM-HTML>

<p><i>IfcShearModulusMeasure</i> is a measure of shear modulus.</p>
<p>Usually measured in N/m2.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4546;IfcLinearMomentMeasure;"<EPM-HTML>

<p><i>IfcLinearMomentMeasure</i> is a measure of linear moment.</p>
<p>Usually measured in Nm/m.</p>
<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC Release 2x.
</blockquote>

</EPM-HTML>"
4547;IfcLuminousIntensityDistributionMeasure;"<EPM-HTML> 

<p><i>IfcLuminousIntensityDistributionMeasure</i> is a measure of the luminous intensity of a light source that changes according to the direction of the ray. It is normally based on some standardized distribution light distribution curves.</p> 

<p>Usually measured in Candela/Lumen (cd/lm) or (cd/klm). </p> 

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote>
 
</EPM-HTML>"
4548;IfcCurvatureMeasure;"<EPM-HTML>

<p><i>IfcCurvatureMeasure</i> is a measure for curvature, which is defined as the change of slope per length.
  This is typically a computed value in structural analysis.
  It is usually measured in rad/m.
</p>

<p>Type: REAL</P>

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4549;IfcMassPerLengthMeasure;"<EPM-HTML>

<p><i>IfcMassPerLengthMeasure</i> is a measure for mass per length. For example for rolled steel profiles the weight of
  an imaginary beam is usually expressed by kg/m length for cost calculation and
  structural analysis purposes.
</p>

<p>Type: REAL</p>

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4550;IfcModulusOfLinearSubgradeReactionMeasure;"<EPM-HTML>

<p><i>IfcModulusOfLinearSubgradeReactionMeasure</i> is a measure for modulus of linear subgrade reaction, which expresses the elastic bedding of a linear structural element per length, such as for a beam. It is typically measured in N/m^2.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC Release 2x2.
</blockquote> 

</EPM-HTML>

"
4551;IfcModulusOfRotationalSubgradeReactionMeasure;"<EPM-HTML>

<p><i>IfcModulusOfRotationalSubgradeReactionMeasure</i> is a measure for modulus of rotational subgrade reaction, which expresses the rotational elastic bedding of a linear structural element per length, such as for a beam. It is typically measured in Nm/(m*rad). 
</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>"
4552;IfcRotationalMassMeasure;"<EPM-HTML>

<p>The rotational mass measure denotes the inertia of a body with respect to angular acceleration.</p>
<p>It is usually measured in kg*m^2.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4553;IfcSectionalAreaIntegralMeasure;"<EPM-HTML>

<p>The sectional area integral measure is typically used in torsional analysis. It is usually measured in m^5.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4554;IfcSectionModulusMeasure;"<EPM-HTML>

<p><i>IfcSectionModulusMeasure</i> is a measure for the resistance of a cross section against bending or torsional moment.  It is usually measured in m^3.</p>

<p>Type: REAL</p> 

<blockquote class=""history"">
HISTORY New type in IFC Release 2x2.
</blockquote> 

</EPM-HTML>
"
4555;IfcTemperatureGradientMeasure;"<EPM-HTML>

<p>The temperature gradient measures the difference of a temperature per lenght, as for instance used in an external wall or its layers.  It is usually measured in K/m.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4556;IfcThermalExpansionCoefficientMeasure;"<EPM-HTML>

<p><i>IfcThermalExpansionCoeffientMeasure</i> is a measure of the thermal expansion coefficient of a material, which expresses its elongation (as a ratio) per temperature difference. It is usually measured in 1/K. A positive elongation per (positive) rise of temperature is expressed by a positive value.</p>
<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4557;IfcWarpingConstantMeasure;"<EPM-HTML>

<p><i>IfcWarpingConstantMeasure</i> is a measure for the warping constant or warping resistance of a cross section under torsional loading. It is usually measured in m^6.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4558;IfcWarpingMomentMeasure;"<EPM-HTML>

<p>The warping moment measure is a measure for the warping moment, which occurs in warping torsional analysis. It is usually measured in kN*m^2.</p>

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>
"
4559;IfcSoundPowerMeasure;"<EPM-HTML> 

<p>A sound power measure is a measure of total radiated noise with units of decibels with a reference value of picowatts.</p>
 
<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>"
4560;IfcSoundPressureMeasure;"<EPM-HTML> 

<p>A sound pressure measure is a measure of the pressure fluctuations superimposed over the ambient pressure level with units of decibels with a reference value of micropascals.</p> 

<p>Type: REAL </p> 

<blockquote class=""history"">
HISTORY New type in IFC2x2.
</blockquote> 

</EPM-HTML>"
4561;IfcHeatingValueMeasure;"<EPM-HTML>

<p><i>IfcHeatingValueMeasure</i> defines the amount of energy released (usually in MJ/kg) when a fuel is burned.</p>

<blockquote class=""history"">
HISTORY: This is new type in IFC2x2.
</blockquote> 

</EPM-HTML>"
4563;IfcPHMeasure;"<EPM-HTML>

<p><i>IfcPHMeasure</i> is a measure of the molar hydrogen ion concentration in a liquid (usually defined as the measure of acidity) in a range from 0 to 14.</p>

<blockquote class=""history"">
HISTORY: New type in IFC 2x2.
</blockquote> 

</EPM-HTML>"
4565;IfcIonConcentrationMeasure;"<EPM-HTML>

<p><i>IfcIonConcentrationMeasure</i> is a measure of particular ion concentration in a liquid, given in mg/L.</p>

<blockquote class=""history"">
HISTORY: New type in IFC2x2.
</blockquote> 

</EPM-HTML>"
4566;IfcTemperatureRateOfChangeMeasure;"<EPM-HTML>

<p>The temperature rate of change measures the difference of a temperature per time (positive: rise, negative: fall), as for instance used with heat sensors. It is for example measured in K/s (Kelvin per second).</p>

<p>Type: REAL</p> 

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x4.
</blockquote> 

</EPM-HTML>"
4777;IfcTextAlignment;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>:&nbsp;This property describes how text is aligned within the element. The actual justification algorithm used is user agent and human language dependent. If 'justify' is not supported, the user agent will supply a replacement. Typically, this will be 'left' for western languages. Values are:</p>
<ul>
  <li>left</li>
  <li>right</li>
  <li>center</li>
  <li>justify</li>
</ul>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definition is text-align.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x3.
</blockquote>

</EPM-HTML>"
4779;IfcTextDecoration;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: This property describes decorations that are added to the text of an element. A value of 'blink' causes the text to blink.. Values are:</p>
<ul>
  <li>none</li>
  <li>underline</li>
  <li>overline</li>
  <li>line-through</li>
  <li>blink</li>
</ul>

<p>User agents must recognize the keyword 'blink', but are not required to support the blink effect.</p>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definition is text-decoration.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x3.
</blockquote>

</EPM-HTML>"
4781;IfcTextTransformation;"<EPM-HTML>

<p><u>Definition from CSS1 (W3C Recommendation)</u>: This property describes how the cases of characters are handled. Values are:</p>
<ul>
  <li>capitalize: uppercases the first character of each word</li>
  <li>uppercase: uppercases all letters of the element</li>
  <li>lowercase: lowercases all letters of the element</li>
  <li>none</li>
</ul>

<blockquote class=""note"">
NOTE&nbsp; Corresponding CSS1 definition is text-transform.
</blockquote>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x3.
</blockquote>

</EPM-HTML>"
4865;IfcSpecularExponent;"<EPM-HTML> 

<p>The <i>IfcSpecularExponent</i> defines the datatype for exponent determining the sharpness of the 'reflection'. reflection is made sharper with large values of the exponent, such as 10.0. Small values, such as 1.0, decrease the specular fall-off.</p> 

<p><i>IfcSpecularExponent</i> is of type REAL.</p>

<blockquote class=""note"">
NOTE: The datatype relates to the definition of specular_exponent in ISO 10303-46 entity surface_style_reflectance_ambient_diffuse_specular.
</blockquote> 

<blockquote class=""history"">
HISTORY: New type in IFC2x2.
</blockquote>

</EPM-HTML>"
4866;IfcSpecularRoughness;"<EPM-HTML> 

<p>The <i>IfcSpecularRoughness</i> defines the datatype for the reflection resulting from the roughness of a surface through the height of surface impurities where the specular highlight is made sharper with small values for the roughness, such as 0.1. </p> 

<p>Applies to ""glass"", ""metal"", ""mirror"" and ""plastic"" reflection models. Larger values, close to 1.0 decrease the specular fall-off.</p> 

<p><i>IfcSpecularRoughness</i> is of type REAL. It is constraint to values between (and including) 0 and 1.</p>

<blockquote class=""note"">
NOTE: The datatype relates to the definition of ""shiness"" in VRML97, which is the reciprocate value to the specular roughness.
</blockquote> 

<blockquote class=""history""> 
HISTORY: New type in Release IFC2x2.
</blockquote>

</EPM-HTML>"
4973;IfcBoxAlignment;"<EPM-HTML>

<p>The box alignment specifies the alignment of the text box relative to its position. The following string values shall be used:</p>
<ul>
  <li>top-left</li>
  <li>top-middle</li>
  <li>top-right</li>
  <li>middle-left</li>
  <li>center</li>
  <li>middle-right</li>
  <li>bottom-left</li>
  <li>bottom-middle</li>
  <li>bottom-right</li>
</ul>

<blockquote class=""note"">
NOTE&nbsp; The top-left is the default value.
</blockquote>

<p>Figure 298 illustrates alignment values.</p>

<table>
<tr><td><img alt=""9 alignment values"" src=""figures/IfcBoxAlignment_Fig1.gif"" height=""250"" width=""400""></td></tr>
<tr><td><p class=""figure"">Figure 298 &mdash; Box alignment values</p></td></tr>
</table>

<p>Figure 299 illustrates use of alignment values together with the placement and planar extent.</p>
<table>
<tr><td><img alt=""use with planar extent"" src=""figures/IfcBoxAlignment_Fig2.gif"" height=""300"" width=""500""></td></tr>
<tr><td><p class=""figure"">Figure 299 &mdash; Box alignment examples</p></td></tr>
</table>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC2x2 Addendum2.
</blockquote>

<blockquote class=""change-ifc2x3"">
IFC2x3 CHANGE&nbsp; The <i>IfcBoxAlignment</i> has been added.
</blockquote>

</EPM-HTML>"
5293;IfcGloballyUniqueId;"<epm-html>

<p>An <i>IfcGloballyUniqueId</i> holds an encoded string identifier that is used to uniquely identify an IFC object. An <i>IfcGloballyUniqueId</i> is a Globally
 Unique Identifier (GUID) which is an auto-generated 128-bit number. Since this identifier is
 required for all IFC object instances, it is desirable to compress it to reduce overhead. The encoding of the base 64 character set is shown below:
	</p>
    <blockquote>
		<p><font FACE=""Courier New"" size=""-1"">        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6
		<br />&nbsp;0123456789012345678901234567890123456789012345678901234567890123<br />
		""0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_$"";
        </font></p>
    </blockquote>

<p>The resulting string is a fixed 22 character length string to be exchanged within the IFC exchange file structure.</p>
	
<p>Refer to the BuildingSMART website (<a href=""http://www.buildingsmart-tech.org"">www.buildingsmart-tech.org</a>) for more information and sample encoding algorithms.</p>

<blockquote class=""history"">
HISTORY&nbsp; New type in IFC R1.5.1.
</blockquote>

</epm-html>
"
5463;IfcDimensionCount;"<EPM-HTML> 

<p><u>Definition from ISO/CD 10303-42</u>:1992: A dimension count is a positive integer used to define the coordinate space dimensionality. </p> 

<p>The <I>IfcDimensionCount</I> is restricted to have the dimensionality of either 1, 2, or 3 - the WR1 had been added as an addition to the ISO 10303:42 entity dimension_count. In contrary to the ISO 10303:42 constraint, that all geometric representation items within a geometric representation context are forced to have the same dimension count, the IFC geometry allows mixed dimensions, particularly when defining the boundary of planar surfaces. </p> 

<blockquote class=""note"">
NOTE Corresponding ISO 10303 type: dimension_count, please refer to ISO/IS 10303-42:1994, p. 14 for the final definition of the formal standard.
</blockquote>
 
<blockquote>
HISTORY New Type in IFC Release 1.5
</blockquote> 

</EPM-HTML>"
