<element name=“addressBook” xmlns=“relaxng.org/ns/structure/1.0” xmlns:a=“www.example.com/annotation”>
<zeroOrMore> <element name="card"> <a:documentation>Information about a single email address.</a:documentation> <element name="name"> <text/> </element> <element name="email"> <text/> </element> </element> </zeroOrMore>
</element>