<element name=“addressBook” xmlns=“relaxng.org/ns/structure/1.0”>
<zeroOrMore> <element name="card"> <choice> <attribute name="name"> <text/> </attribute> <group> <attribute name="givenName"> <text/> </attribute> <attribute name="familyName"> <text/> </attribute> </group> </choice> <attribute name="email"> <text/> </attribute> </element> </zeroOrMore>
</element>