Within a citation (such as a <mixed-citation> or an <element-citation>), the title of a cited book is tagged as <source>; but when provided, the title of a chapter within that book is tagged as <chapter-title>.
This element is limited to identifying the title of a book chapter in bibliographic references (<element-citation> and <mixed-citation>). It is not used to identify the title of an actual <chapter> in the current document, because there is not such element as <chapter>.
<!ELEMENT chapter-title
(#PCDATA %chapter-title-elements;)* >(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | hr | bold | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x | break)*
Any combination of:
<element-citation>, <mixed-citation>, <product>, <related-article>, <related-object>
In an element-style bibliographic reference (punctuation and spacing removed):
...
<ref>
<element-citation publication-type="book" publication-format="print">
<name><surname>Al-Ibrahim</surname>
<given-names>MS</given-names></name>
<name><surname>Gross</surname>
<given-names>JY</given-names></name>
<chapter-title>Tobacco use</chapter-title>
<person-group person-group-type="editor">
<name><surname>Walker</surname>
<given-names>HK</given-names></name>
<name><surname>Hall</surname>
<given-names>WD</given-names></name>
<name><surname>Hurst</surname>
<given-names>JW</given-names></name>
</person-group>
<source>Clinical methods: the history, physical,
and laboratory examinations</source>
<publisher-loc>Stoneham (MA)</publisher-loc>
<publisher-name>Butterworth Publishers</publisher-name>
<year content-type="copyright-year">1990</year>
<fpage>214</fpage>
<lpage>216</lpage>
</element-citation>
</ref>
...
In a mixed-style bibliographic reference (punctuation and spacing preserved):
...
<ref>
<mixed-citation publication-type="book" publication-format="print">
<string-name><surname>Al-Ibrahim</surname>
<given-names>MS</given-names></string-name>,
<string-name><surname>Gross</surname>
<given-names>JY</given-names></string-name>.
<chapter-title>Tobacco use</chapter-title>. In:
<person-group person-group-type="editor">
<string-name><surname>Walker</surname>
<given-names>HK</given-names></string-name>,
<string-name><surname>Hall</surname>
<given-names>WD</given-names></string-name>,
<string-name><surname>Hurst</surname>
<given-names>JW</given-names></string-name></person-group>, editors.
<source>Clinical methods: the history, physical,
and laboratory examinations</source>.
<publisher-loc>Stoneham (MA)</publisher-loc>:
<publisher-name>Butterworth Publishers</publisher-name>;
©<year content-type="copyright-year">1990</year>.
p. <fpage>214</fpage>-<lpage>216</lpage>.</mixed-citation>
</ref>
...
references3.ent