pubmed_180101.dtd: sub element
<p>Sidebar</p>
Element:
sub
Contains subscript text.
Content Model
( #PCDATA | b | i | sup | sub | u )*
Contains:
#PCDATA
<b>
<i>
<sup>
<sub>
<u>
May be contained in:
<CollectionTitle>
<Affiliation>
<AbstractText>
<Suffix>
<sub>
<BookTitle>
<sup>
<b>
<CoiStatement>
<SectionTitle>
<Keyword>
<i>
<u>
<CollectiveName>
<ArticleTitle>
<VolumeTitle>
<PublisherName>
<CitationString>
<VernacularTitle>
<Param>