<rng:element name="addressBook" xmlns:rng="http://relaxng.org/ns/structure/1.0"> <rng:zeroOrMore> <rng:element name="card"> <rng:element name="name"> <rng:text/> </rng:element> <rng:element name="email"> <rng:text/> </rng:element> </rng:element> </rng:zeroOrMore> </rng:element>
