<refentry id="subjectset.element">
<?dbhtml filename="subjectset.html"?>
<refentryinfo>
<pubdate>$Date$</pubdate>
<releaseinfo>$Revision$</releaseinfo>
</refentryinfo>

<refmeta>
<indexterm><primary>elements</primary>
<secondary>subjectset</secondary></indexterm>
<refentrytitle>subjectset</refentrytitle>
<refmiscinfo>Element</refmiscinfo>
</refmeta>
<refnamediv>
<refname>subjectset</refname>
<refpurpose>&subjectset.purpose;</refpurpose>
</refnamediv>

&subjectset.synopsis.gen;
<refsect1 condition='ref.description'><title>Description</title>

<para>
A <sgmltag>SubjectSet</sgmltag> is a container for a set of
<sgmltag>Subject</sgmltag>s.  All of the <sgmltag>Subject</sgmltag>s within a
<sgmltag>SubjectSet</sgmltag> should come from the <emphasis>same</emphasis>
controlled vocabulary.
</para>
<para>
A document can be described using terms from more than one controlled
vocabulary.  In order to do this, you should use the
<sgmltag class='attribute'>Scheme</sgmltag> attribute to distinguish between
controlled vocabularies.
</para>

<refsect2><title>Processing expectations</title>
<para>
&format.context; Subjects are rarely displayed to a reader. Usually, they
are reserved for searching and retrieval purposes.
</para>
<para>DocBook does not specify a relationship between <sgmltag>SubjectSet</sgmltag>s
in different parts of a document or between a <sgmltag>SubjectSet</sgmltag> and
the <sgmltag>SubjectSet</sgmltag>s of enclosing parts of the document.
</para>
</refsect2>



&subjectset.parents.gen;
&subjectset.children.gen;
</refsect1>
<refsect1 condition='ref.elem.attrdesc'><title>Attributes</title>
<variablelist>
<varlistentry><term>scheme</term>
<listitem>
<para>
<sgmltag class='attribute'>Scheme</sgmltag> identifies the controlled vocabulary 
used by this <sgmltag>SubjectSet</sgmltag>'s terms.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 condition='ref.elem.seealso'><title>See Also</title>
&subjectset.seealso.gen;
</refsect1>
<refsect1><title>Examples</title>

<informalexample role="example-source">
<programlisting>&subjectset.example.1.txt;</programlisting>
</informalexample>

&subjectset.example.seealso.gen;
</refsect1>
</refentry>

