Element: CitationSubset
States the subset(s) for which the MEDLINE record was created. Most citations are from journals indexed for MEDLINE as part of "Index Medicus", indicated by the citation subset value "IM".
A small percentage of records in PubMed are in the OLDMEDLINE subset, indicated by the citation subset value "OM".
Content Model
( #PCDATA )
Contains only text (#PCDATA)
May be contained in:
Examples
<CitationSubset>IM</CitationSubset>