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            Holds a keyed collection of same-typed
data items.
            
           
            Items in
            
             map
            
            variables are key-based. Specific
data items can be accessed using XPath expressions that use the
key associated with the data item. (See
            
             Accessing data in data collections
            
            .)
            
           
            
             Note:
            
            The order of data items in
            
             map
            
            variables
can change.
            
           
           
          
          
           
          
          
          
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