The marker for the end of a range when an index term embedded into the narrative of a document is the start of a range.
When the <index-term> is the start of a range, the @rid attribute of an <index-term-range-end> must point to the @id of the <index-term>.
This is an EMPTY element, since all the information naming the index term is already present in the <index-term> element to which this element points.
<!ELEMENT index-term-range-end
%index-term-range-end-model; >EMPTY
This is an EMPTY element
<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>, <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>
...
<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>
...