Name of one subject or topic used to describe a book or component of a book. Such topics and groupings of topics are typically used to provide headings for groups of documents or document components in a printed, or online, generated Table of Contents.
In some journals, articles are grouped into categories which this Tag Set calls <subject>s, which may be grouped into <subj-group>s. Similarly, a BITS book may use this subject-grouping mechanism to make real or virtual groups for related book parts. <book-part>s. These subject categories are typically shown in the Table of Contents, at the top of the first print or display page, or on the web splash page for the book or book part. Sometimes the grouping or category refers to the type of document, such as “Essay”, “Lesson”, “Award”, or “Unit”. Sometimes the grouping refers to subject areas, such as “Physical Sciences”, “Biological Sciences”, or “Social Sciences”. Sometimes the grouping refers to topics within the larger subject areas, such as “Applied Math”, “Biology”, or “Chemistry”. For example, a one-level grouping might be:
<subj-group>
<subject>Notation</subject>
</subj-group>
or, as another example:
<subj-group>
<subject>Magnetic Resonance</subject>
</subj-group>And a four-level grouping might be:
<subj-group subj-group-type="keywords">
<subject>Biological Sciences</subject>
<subj-group subj-group-type="keywords">
<subject>Neuroscience</subject>
<subj-group subj-group-type="keywords">
<subject>Cellular and Molecular Biology</subject>
<subj-group subj-group-type="keywords">
<subject>Blood–brain barrier</subject>
</subj-group>
</subj-group>
</subj-group>
</subj-group>Both books and book parts may also be assigned to more than one grouping. For example, if a book part is classified as “Biochemistry” under “Biological Sciences” and “Chemistry” under “Physical Sciences”, the <subj-group> container element may repeat. For example:
<subj-group>
<subject>Chemical Disciplines</subject>
<subj-group>
<subject>Biological Sciences</subject>
<subj-group>
<subject>Biochemistry</subject>
</subj-group>
</subj-group>
<subj-group>
<subject>Physical Sciences</subject>
<subj-group>
<subject>Chemistry</subject>
</subj-group>
</subj-group>
</subj-group>
<!ELEMENT subject (#PCDATA %subject-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 | index-term | index-term-range-end | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x | break)*
Any combination of:
<book>
<book-meta>...</book-meta>
<front-matter>...</front-matter>
<book-body>
<book-part id="bid.2" book-part-type="chapter">
<book-part-meta>
<subj-group>
<subject>Physical Sciences</subject>
<subj-group>
<subject>Introductory Chemistry</subject>
<subject>Organic Chemistry</subject>
<subject>Physical Chemistry</subject>
</subj-group>
</subj-group>
<subj-group>
<subject>Biological Sciences</subject>
<subj-group>
<subject>Biochemistry</subject>
</subj-group>
</subj-group>
<title-group>
<label>1</label>
<title>GenBank: The Nucleotide Sequence Database</title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Mizrachi</surname>
<given-names>Ilene</given-names></name>
</contrib>
</contrib-group>
<pub-history>...</pub-history>
</book-part-meta>
<body>
<sec id="bid.3">...</sec>
</body>
<back>...</back>
</book-part>
</book-body>
</book>
JATS-articlemeta1.ent