Generated text or punctuation. Typically used when:
<!ELEMENT x (#PCDATA %x-elements;)* >
(#PCDATA | bold | fixed-case | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | ruby | named-content | styled-content | sub | sup | x)*
Any combination of:
<abbrev>, <abstract>, <ack>, <address>, <addr-line>, <aff>, <alt-title>, <anonymous>, <answer>, <app>, <app-group>, <article-title>, <attrib>, <author-notes>, <award-id>, <bio>, <body>, <bold>, <book-meta>, <book-part-meta>, <book-title>, <book-volume-id>, <book-volume-number>, <boxed-text>, <chapter-title>, <chem-struct>, <collab>, <collection-meta>, <comment>, <compound-kwd-part>, <conf-acronym>, <conf-date>, <conference>, <conf-loc>, <conf-name>, <conf-num>, <conf-sponsor>, <conf-theme>, <contrib>, <contrib-group>, <copyright-holder>, <copyright-statement>, <corresp>, <country>, <date-in-citation>, <def-head>, <def-item>, <def-list>, <degrees>, <disp-formula>, <disp-quote>, <edition>, <element-citation>, <email>, <etal>, <ext-link>, <fax>, <fixed-case>, <fn-group>, <funding-source>, <funding-statement>, <given-names>, <glossary>, <gov>, <index>, <index-div>, <index-entry>, <index-group>, <inline-formula>, <inline-supplementary-material>, <institution>, <isbn>, <issn>, <issn-l>, <issue>, <issue-part>, <issue-title>, <italic>, <kwd>, <kwd-group>, <label>, <license-p>, <list>, <long-desc>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-book-part-body>, <named-content>, <nav-pointer>, <notes>, <on-behalf-of>, <overline>, <p>, <part-title>, <patent>, <person-group>, <phone>, <prefix>, <preformat>, <product>, <pub-date>, <publisher-loc>, <publisher-name>, <question>, <ref>, <ref-list>, <related-article>, <related-object>, <role>, <roman>, <sans-serif>, <sc>, <sec>, <see>, <see-also>, <see-also-entry>, <see-entry>, <self-uri>, <series>, <sig>, <sig-block>, <size>, <source>, <speaker>, <std-organization>, <strike>, <string-conf>, <string-date>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <surname>, <table-wrap-foot>, <target>, <td>, <term>, <term-head>, <th>, <title>, <toc>, <toc-div>, <toc-entry>, <toc-group>, <trans-abstract>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <unstructured-kwd-group>, <uri>, <verse-line>, <volume>, <volume-id>, <volume-series>, <volume-title>, <x>, <xref>
In an element-style bibliographic reference (punctuation and spacing removed):
...
<ref>
<label>13</label><x>. </x>
<element-citation publication-type="journal"
publication-format="print">
<collab>American College of Dentists, Board of
Regents</collab>
<article-title>The ethics of quackery and fraud
in dentistry: a position paper</article-title>
<source>J Am Coll Dent</source>
<year iso-8601-date="2003">2003</year>
<volume>70</volume>
<issue>3</issue>
<fpage>6</fpage>
<lpage>8</lpage>
</element-citation>
</ref>
...
In a mixed-style bibliographic reference (punctuation and spacing preserved):
...
<ref>
<label>13</label><x>. </x>
<mixed-citation publication-type="journal"
publication-format="print">
<collab>American College of Dentists, Board of
Regents</collab>. <article-title>The ethics of
quackery and fraud in dentistry: a position
paper</article-title>. <source>J Am Coll
Dent</source>. <year iso-8601-date="2003">2003</year>;
<volume>70</volume>(<issue>3</issue>):
<fpage>6</fpage>-<lpage>8</lpage>.</mixed-citation>
</ref>
...
In a <kwd-group>:
...
<kwd-group id="h1001">
<title>Key words.</title>
<kwd>Agricultural landscape</kwd><x>, </x>
<kwd>Akaike weights</kwd><x>, </x>
<kwd>amphibians</kwd><x>, </x>
<kwd>geographical range boundary</kwd><x>, </x>
<kwd>habitat loss and fragmentation</kwd><x>, </x>
<kwd>mammals</kwd><x>, </x>
<kwd>niche breadth</kwd><x>, </x>
<kwd>vertebrates</kwd><x>.</x>
</kwd-group>
...
In a <def-list>:
...
<def-list list-type="simple">
<def-item>
<term>AFLP</term><x>, </x>
<def><p>Amplified Length Polymorphism</p></def>
</def-item><x>; </x>
<def-item>
<term>AG</term><x>, </x>
<def><p>Anastomosis Groups</p></def>
</def-item><x>; </x>
<def-item>
<term>BSC</term><x>, </x>
<def><p>Biological Species Concept</p></def>
</def-item><x>; </x>
<def-item>
<term>EDH</term><x>, </x>
<def><p>Enviromental Deterministic Hypothesis</p></def>
</def-item><x>; </x>
<def-item>
<term>FS</term><x>, </x>
<def><p>Female-Sterile</p></def>
</def-item><x>.</x>
</def-list>
...