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sxml:id id-indexprocedure

Returns a procedure that accepts a nodeset and returns a nodeset containing the elements in the id-index that match the string-values of each entry of the nodeset. XPath Rec. 4.1

The id-index is an alist with unique IDs as key, and elements as values:

 id-index = ( (id-value . element) (id-value . element) ... )