Individual component of a multi-part subject (for example, subject term, code for the term).
Subjects are used, typically, in searching and discovery or to provide headings for groups of book parts in a printed or online generated Table of Contents. This element can name one of the components of a subject when that subject is a multi-part subject rather than a simple subject.
Best Practice: The @content-type attribute should be used to indicate the type of the various subject parts, for example, “text”, “code”, “sponsor”, “taxonomy number”, etc.
<!ELEMENT compound-subject-part
(#PCDATA %compound-subject-part-elements;)* >(#PCDATA | bold | fixed-case | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | ruby | alternatives | inline-graphic | private-char | chem-struct | inline-formula | named-content | styled-content | sub | sup)*
Any combination of:
Coded subjects:
...
<book-part-meta>
<subj-group>
<compound-subject>
<compound-subject-part
content-type="code">A1</compound-subject-part>
<compound-subject-part
content-type="text">Cellular and Molecular Biology
</compound-subject-part>
</compound-subject>
<subj-group>
<compound-subject>
<compound-subject-part
content-type="code">A11</compound-subject-part>
<compound-subject-part
content-type="text">Blood–brain
barrier</compound-subject-part>
</compound-subject>
<subj-group>
<compound-subject>
<compound-subject-part
content-type="code">A115</compound-subject-part>
<compound-subject-part
content-type="text">Permiability
</compound-subject-part>
</compound-subject>
</subj-group>
</subj-group>
</subj-group>
<title-group>...</title-group>
<contrib-group>...</contrib-group>
...
</book-part-meta>
...
Using the type attribute to name the source and components:
...
<book-part-meta>
<subj-group subj-group-type="flesch-subject-headings">
<compound-subject>
<compound-subject-part
content-type="flesch-code2">A2</compound-subject-part>
<compound-subject-part
content-type="flesch-short-form">Neurobiology
</compound-subject-part>
</compound-subject>
</subj-group>
<title-group>...</title-group>
<contrib-group>...</contrib-group>
...
</book-part-meta>
...