Container element for the subject matter designations describing an article’s content.
For some journals, articles are grouped into categories called Subject Group <subj-group>, with the category indicated in the article’s display. Sometimes the grouping or category refers to the type of article, such as “Essay”, “Commentary”, or “Article”. 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 three-level grouping might be:
<subj-group> <subject>Articles</subject> <subj-group> <subject>Biological Sciences</subject> <subj-group> <subject>Entomology</subject> </subj-group> </subj-group> </subj-group>
And a one-level grouping might be:
<subj-group> <subject>Retraction</subject> </subj-group>
or, alternatively:
<subj-group> <subject>Essay</subject> </subj-group>
Articles may also be assigned to more than one grouping. For example, if an article is classified as “Biochemistry” under “Biological Sciences” and “Chemistry” under “Physical Sciences”, the <subj-group> wrapper may repeat.
For example:
<subj-group> <subject>Articles</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>
The following, in order:
<article> <front> <journal-meta> ... </journal-meta> <article-meta> ... <article-id pub-id-type="pmid">11274384</article-id> <article-categories> <subj-group> <subject>Physical Sciences</subject> <subj-group> <subject>Chemistry</subject> </subj-group> </subj-group> <subj-group> <subject>Biological Sciences</subject> <subj-group> <subject>Biophysics</subject> </subj-group> </subj-group> </article-categories> <title-group> ... </title-group> ... </article-meta> </front> <body> ... </body> <back> ... </back> </article>
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