A small example of XQuery Data Definition Facility..

sample-xqddf.xqy

(: A small example of XQuery Data Definition Facility.. :)

(: Declare a ‘users’ collection :)
declare collection users as element()*;

(: Declare an index on top of ‘users’ using @id :)
declare automatically maintained index users-by-id
 	on nodes xqddf:collection( xs:QName("users") )
 		by @id as xs:string;

(: Filling and using the index :)
xqddf:insert-nodes(
 	xs:QName("users"), <user id="geert"/>);

xqddf:probe-index-point(
 	xs:QName("users-by-id"), "geert");