Unique identifier of an element; allows element to be cross-referenced. Value must be
unique across a document, not just for an element type.
Value | Meaning |
---|
An XML identifier (ID) | A unique identifier for the element. XML parsers can verify that an element pointing to one of these is pointing to a valid ID. |
Restriction: This attribute must be specified if the element is used. |
<abbrev>,
<abstract>,
<ack>,
<address>,
<aff>,
<aff-alternatives>,
<alt-text>,
<app>,
<app-group>,
<array>,
<article-title>,
<attrib>,
<author-comment>,
<author-notes>,
<award-group>,
<award-id>,
<bio>,
<book-part>,
<book-part-wrapper>,
<boxed-text>,
<caption>,
<chem-struct>,
<chem-struct-wrap>,
<col>,
<colgroup>,
<collab>,
<compound-kwd>,
<compound-subject>,
<contrib>,
<contrib-group>,
<corresp>,
<custom-meta>,
<dedication>,
<def>,
<def-item>,
<def-list>,
<disp-formula>,
<disp-formula-group>,
<disp-quote>,
<element-citation>,
<ext-link>,
<fig>,
<fig-group>,
<fn>,
<fn-group>,
<foreword>,
<front-matter-part>,
<funding-source>,
<funding-statement>,
<glossary>,
<glyph-data>,
<graphic>,
<index>,
<index-div>,
<index-entry>,
<index-group>,
<index-term>,
<inline-formula>,
<inline-graphic>,
<inline-supplementary-material>,
<institution>,
<kwd>,
<kwd-group>,
<list>,
<list-item>,
<long-desc>,
<media>,
<milestone-end>,
<milestone-start>,
<mixed-citation>,
<mml:math>,
<named-content>,
<nav-pointer>,
<nested-kwd>,
<note>,
<notes>,
<p>,
<person-group>,
<preface>,
<preformat>,
<product>,
<ref>,
<ref-list>,
<related-article>,
<related-object>,
<sec>,
<see-also-entry>,
<see-entry>,
<sig>,
<sig-block>,
<source>,
<speech>,
<statement>,
<std-organization>,
<subject>,
<supplementary-material>,
<table>,
<table-wrap>,
<table-wrap-group>,
<tbody>,
<td>,
<term>,
<tex-math>,
<tfoot>,
<th>,
<thead>,
<title>,
<toc>,
<toc-div>,
<toc-entry>,
<toc-group>,
<tr>,
<trans-abstract>,
<trans-source>,
<trans-title>,
<trans-title-group>,
<unstructured-kwd-group>,
<verse-group>,
<xref>Value | Meaning |
---|
An XML identifier (ID) | A unique identifier for the element. XML parsers can verify that an element pointing to one of these is pointing to a valid ID. |
Restriction: This is an optional attribute; there is no default. |