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<element name="ab:addressBook" xmlns:ab="http://www.example.com/addressBook" xmlns:a="http://www.example.com/address" xmlns="http://relaxng.org/ns/structure/1.0"> <zeroOrMore> <element name="ab:card"> <element name="a:name"> <text/> </element> <element name="a:email"> <text/> </element> </element> </zeroOrMore> </element>