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<def-head> Definition List: Definition Head

Heading over the second column (the definition column) of a definition list (two-part list).
Related Elements
A <def-list> may take a <label> that provides it with a number, followed by an optional <title> naming the entire list, followed by optional headings for terms and their definitions. <term-head> contains the heading over the first (term) column, and <def-head> contains the heading for the second (definition) column; neither serves as a container element for terms or definitions. Individual <term>s and their <def>s are paired in <def-item>s. Definition lists are recursive, so following all the terms and definitions, there may be one or more embedded <def-list> elements.
Attributes

Base Attributes

id
xml:base
Models and Context
May be contained in
<def-list>
Description
Any combination of:
Content Model
<!ELEMENT  def-head     (#PCDATA %def-head-elements;)*               >
Expanded Content Model

(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | bold | fixed-case | italic | monospace | num | overline | roman | sans-serif | sc | strike | underline | ruby | alternatives | inline-code | inline-graphic | inline-media | 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 | tbx:entailedTerm | xref | sub | sup)*

Tagged Sample

Heading for <def-list> definition column [rare in standards] 

...
<def-list>
 <term-head>Term</term-head>
 <def-head>Definition</def-head>
 <def-item>
  <term>back matter</term>
  <def><p>Any material printed at the end of the journal, after 
   the main articles. May include ...</p></def>
 </def-item>
 ...
</def-list>
...