Language reference : Base architecture : Classification elements : Subject scheme maps : subjectRel
   
subjectRel
The <subjectRel> element contains a set of subjects that are related in some manner. Each group of subjects is contained in a <subjectRole> element; the associations between different columns in the same row are evaluated in the same way as those in a <relrow> (from which <subjectRel> is specialized) but define relationships between the subjects instead of links between topic documents.
Contains
Note: These models represent only the default document types distributed by OASIS. Actual content models will differ with each new document type.
Doctype
Content model
subjectScheme
( (subjectRole) (one or more) )
Contained by
Doctype
Content model
subjectScheme
Inheritance
- map/relrow subjectScheme/subjectRel
Example 175. Example
The subject relationship table in this example establishes environmentFor relationships between operating systems and applications. Based on the subjectRole element, subjects in the first column are operating systems which are the environment for an application, while subjects in the second column are applications that run in that environment. For a user interested in content about the operating system, content about the applications may also be relevant.
<subjectScheme>
<hasKind>
<subjectdef keys="operatingSystem">
<subjectdef keys="linuxOS"/>
<subjectdef keys="windowsOS"/>
</subjectdef>
<subjectdef keys="application">
<subjectdef keys="IDE">
<subjectdef keys="eclipseIDE"/>
<subjectdef keys="visualStudioIDE"/>
</subjectdef>
<subjectdef keys="webBrowser">
<subjectdef keys="firefoxBrowser"/>
<subjectdef keys="ieBrowser"/>
</subjectdef>
</subjectdef>
</hasKind>
...
<subjectRelTable>
<subjectRelHeader>
<subjectRole>
<subjectdef keyref="operatingSystem">
<hasRelated keyref="environmentFor">
<subjectdef keyref="application"/>
</hasRelated>
</subjectdef>
</subjectRole>
<subjectRole>
<subjectdef keyref="application"/>
</subjectRole>
</subjectRelHeader>
<subjectRel>
<subjectRole>
<subjectdef keyref="linuxOS"/>
<subjectdef keyref="windowsOS"/>
</subjectRole>
<subjectRole>
<subjectdef keyref="eclipseIDE"/>
<subjectdef keyref="firefoxBrowser"/>
</subjectRole>
</subjectRel>
<subjectRel>
<subjectRole>
<subjectdef keyref="windowsOS"/>
</subjectRole>
<subjectRole>
<subjectdef keyref="ieBrowser"/>
<subjectdef keyref="visualStudioIDE"/>
</subjectRole>
</subjectRel>
</subjectRelTable>
</subjectScheme>
A table view of the subjectRelTable may look like this; each <subjectRel> represents a single row, and each <subjectRole> represents a cell.
Table 8. subjectRelTable as a table
<subjectdef keyref="operatingSystem">
<hasRelated keyref="environmentFor">
<subjectdef keyref="application"/>
</hasRelated>
</subjectdef>
<subjectdef keyref="application"/>
<subjectdef keyref="linuxOS"/>
<subjectdef keyref="windowsOS"/>
<subjectdef keyref="eclipseIDE"/>
<subjectdef keyref="firefoxBrowser"/>
<subjectdef keyref="windowsOS"/>
<subjectdef keyref="ieBrowser"/>
<subjectdef keyref="visualStudioIDE"/>
Attributes
Name
Description
Data Type
Default Value
Required?
univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups)
A set of related attributes, described in univ-atts attribute group
global-atts attribute group (xtrf, xtrc)
A set of related attributes, described in global-atts attribute group
class
A common attribute described in Other common DITA attributes