Remarks

This element is used in two contexts:

1. Within a two-part list (<def-list>), <def> contains the definition or description of a word or phrase. In this usage, <def> is half of a <term>/<def> pair within an item (<def-item>) in the definition list.
   The term <term> part of a definition item may be a term, a word, a phrase, a picture or icon, an equation, a variable, or anything else that is to be explained. The definition <def> part of an item in a two-part (definition) list need not be a “definition” in the strict dictionary sense of that word. Such a definition could be a discussion, explanation, expansion, or just a few words that tell the reader about the <term>. When a <def-list> is within a <glossary> element, the definitions are assumed to be real definitions.
2. Within an <abbrev> element, <def> contains the definition or expansion of an abbreviation, acronym, or emoticon (“;-)”).

<!ELEMENT  def          %def-model;                                  >

    
...
<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-item>...</def-item>
...
</def-list>
</glossary>
...