The 
                  abbr element represents the abbreviated form of a phrase, term or name.
                  
               
               The 
                  
                     role
                      attribute optionally expresses whether the type of abbreviation.
                  
               
               The 
                  
                     expansion
                      and 
                  
                     name
                      elements provide a mechanism for associating an abbreviation with its uncontracted form. When including an expansion, the
                  
                  ref attribute on the 
                  abbr element links the abbreviation to an 
                  expansion or 
                  name.
                  
               
               The 
                  ref attribute can also be used to reference a 
                  
                     definition
                      element when an explanatory definition of the abbreviation is also needed.
                  
               
             
            Usage Example
        
<head>
    …
    <expansion xml:id="rn">Royal Navy</expansion>
</head>    
<body>       
    …
    <p> … a ten-gun brig, under the command of Captain Fitz Roy, 
        <abbr ref="rn">R.N.</abbr>, sailed from Devonport … </p>
    …  
</body>
    Allowed parents
            address, 
               annoref, 
               annotation (block variant), 
               annotation (phrase variant), 
               m:annotation-xml, 
               aside (block variant), 
               aside (toc variant), 
               block, 
               caption, 
               citation (block variant), 
               citation (phrase variant), 
               d, 
               definition, 
               description (block variant), 
               description (phrase variant), 
               emph, 
               entry (toc variant), 
               entry (index variant), 
               entry (bibliography variant), 
               entry (glossary variant), 
               expansion, 
               xforms:group, 
               h, 
               hd, 
               hpart, 
               item, 
               xforms:label, 
               ln, 
               d:longdesc, 
               meta, 
               name, 
               note (block variant), 
               note (phrase variant), 
               noteref, 
               object (block variant), 
               object (phrase variant), 
               sel:otherwise, 
               p, 
               ssml:phoneme, 
               ssml:prosody, 
               quote (block variant), 
               quote (phrase variant), 
               its:rb, 
               ref, 
               xforms:repeat, 
               its:rt, 
               s, 
               ssml:say-as (phrase variant), 
               ssml:say-as (text variant), 
               d:simplifiedLanguageDescription, 
               span, 
               spine, 
               ssml:sub, 
               d:summary, 
               td, 
               term, 
               th, 
               d:tour and 
               sel:when
               
            
            Allowed children
            This element may contain text.
            
            This element may contain the following children: ssml:break, 
               char, 
               emph, 
               object, 
               pagebreak, 
               ssml:phoneme, 
               ssml:prosody, 
               its:ruby, 
               ssml:say-as, 
               span, 
               sub, 
               ssml:sub, 
               sup and 
               ssml:token
               
            
            Content model and additional requirements
            
               optional attributes: 
@about, 
                  
@by, 
                  
@class, 
                  
@content, 
                  
@datatype, 
                  
@desc, 
                  
@its:dir, 
                  
@its:translate, 
                  
@property, 
                  
@ref, 
                  
@rel, 
                  
@resource, 
                  
@rev, 
                  
@role, 
                  
@sel:selid, 
                  
@ssml:onlangfailure, 
                  
@typeof, 
                  
@xml:base, 
                  
@xml:id, 
                  
@xml:lang and 
                  
@xml:space 
               
               one or more of 
                  
                  a choice of either one of the 14 elements: 
char, 
emph, 
its:ruby, 
object, 
pagebreak, 
span, 
ssml:break, 
ssml:phoneme, 
ssml:prosody, 
ssml:say-as, 
ssml:sub, 
ssml:token, 
sub or 
sup 
                     or text
end of choice 
                  
                
               Note that in addition to restrictions presented in the content model  above, 
                  					use of this element must also respect the following requirements:
                  
                     - The 
                        
ref attribute on an 
                        abbr element must resolve to an 
                        expansion, 
                        name or 
                        definition element.
                        
                      
                     - The 
                        
abbr element must neither be empty nor contain only whitespace.
                        
                      
                  
                  Such requirements take precedence over any conflicting statements in the
                     						content model or in the lists above of allowed children and parents.
                  
                
             
            Namespace
            http://www.daisy.org/ns/z3998/authoring/