The index term to be embedded into the narrative of a document so that an Index can be created programmatically.
An <index-term> is either a single target point or the start of an index range. When it is the start of a range, an @id attribute is required, so that the <index-term-range-end> element can point to the start of the range.
<!ELEMENT index-term %index-term-model; >
(term, (index-term | (see | see-also)*))
The following, in order:
<abbrev>, <addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <book-title>, <book-volume-id>, <book-volume-number>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <conf-acronym>, <conf-loc>, <conf-name>, <conf-num>, <conf-sponsor>, <conf-theme>, <copyright-statement>, <corresp>, <def-head>, <degrees>, <disp-formula>, <edition>, <element-citation>, <email>, <etal>, <ext-link>, <fax>, <fixed-case>, <funding-source>, <funding-statement>, <given-names>, <gov>, <index-term>, <inline-formula>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-title>, <italic>, <kwd>, <label>, <license-p>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <nav-pointer>, <on-behalf-of>, <overline>, <p>, <part-title>, <patent>, <phone>, <prefix>, <preformat>, <product>, <publisher-loc>, <publisher-name>, <related-article>, <related-object>, <role>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <see-also-entry>, <see-entry>, <self-uri>, <series>, <sig>, <sig-block>, <source>, <speaker>, <std-organization>, <strike>, <string-conf>, <string-date>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <surname>, <target>, <td>, <term>, <term-head>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <unstructured-kwd-group>, <uri>, <verse-line>, <volume>, <volume-id>, <volume-series>, <volume-title>, <xref>
...
<p>However, the First Amendment does not bar the
issuance or execution of a warrant to search a newsroom
<index-term><term>Newspapers</term><see-also>Speech
and press</see-also></index-term> to obtain photographs
of demonstrators who had injured several policemen,
although the Court appeared to suggest ...</p>
...
...
<sec id="sec10-3-3">
<title>Interstate Compacts<index-term id="idx313"><term>Interstate
compacts</term><see>States, Agreements with other States</see>
</index-term></title>
<sec id="sec10-3-3-1">...</sec>
<sec id="sec10-3-3-2">
<title content-type="run-in">Subject Matter of Interstate Compacts</title>
<p>For many years after the Constitution was adopted, boundary
disputes continued to predominate as the subject matter of agreements
among the States. Since the turn of the twentieth century, however, the
interstate compact has been used to an increasing extent as an instrument
for state cooperation ...</p>
</sec>
...
<sec id="sec10-3-3-5">
<title content-type="run-in">Legal Effect of Interstate Compacts</title>
<p>Whenever, by the agreement of the States concerned and the
consent of Congress, an interstate compact comes into operation, it
has the same effect as ... <index-term-range-end rid="idx313"/></p>
</sec>
</sec>
...
Illustration of embedded index terms:
...
<p>This is a paragraph with indexing throughout. For example, it
shows primary index terms<index-term><term>primary level index
term</term></index-term>, and then continues with embedded
index terms such as this one.
<index-term><term>primary level index term
<index-term><term>secondary term</term></index-term>
</term></index-term> as the text continues.</p>
<p>Now that you see how it works, this paragraph is slightly
more realistic. It talks about Poodles, for example, <index-term>
<term>poodle</term></index-term>, and then continues on
with other embedded index terms such as this 2-level one.
<index-term><term>dogs
<index-term><term>poodles</term></index-term>
</term></index-term> The text continues, if necessary.</p>
<p>Finally, as an illustration, this is a very complex, multilevel
index term
<index-term>
<term>primary term</term>
<index-term>
<term>secondary term</term>
<index-term>
<term>tertiary term</term>
<index-term>
<term>4th level down</term>
<index-term>
<term>5th and out</term>
<see>a lessor, non-preferred term</see>
<see-also>Be advised you might want to look
at this.</see-also>
</index-term>
</index-term>
</index-term>
</index-term>
</index-term> inside the text of an ordinary paragraph.
Or placed at the end of the paragraph, if that seems
more reasonable.</p>
...