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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 or other designator, followed by an optional <title> naming the entire list, followed by optional headings for terms and their definitions. The <term-head> contains the heading over the first (term) column, and the <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 | hr | bold | fixed-case | italic | monospace | overline |
overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start |
underline-end | ruby | alternatives | 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 | xref | sub | sup |
x)*
Tagged Sample

Heading for <def-list> column 

...
<glossary>
 <def-list>
  <title>ABBREVIATIONS</title>
  <term-head>Abbreviation</term-head>
  <def-head>Expansion</def-head>
  <def-item>
   <term id="G1">PAP I</term>
   <def><p>poly(A)polymerase I</p></def>
  </def-item>
  <def-item>
   <term id="G2">PNPase</term>
   <def><p>polynucleotide phosphorylase</p></def>
  </def-item>
 </def-list>
</glossary>
...