<element 

    xmlns="http://relaxng.org/ns/structure/1.0"

    xmlns:b="http://www.volny.cz/janfrog/xmlsuite/binding"

    datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"

    name="addressbook"

    b:class="RNG::BindingTests::AddressBook">

  <oneOrMore>

    <element name="group"

	     b:class="RNG::BindingTests::Group"

	     b:iv="groups"

	     b:ivType="Set">

      <attribute name="name" b:iv="name">

	<data type="string"/>

      </attribute>

      <oneOrMore>

	<element name="person" 

		 b:class="RNG::BindingTests::Person"

		 b:iv="persons"

		 b:ivType="Set"

		 b:referenceAtt="ref">

	  <choice>

	    <attribute name="ref">

	      <data type="keyref" />

	    </attribute>

	    <group>

	      <optional>

		<attribute name="id" ns="http://www.w3.org/XML/1998/namespace">

		  <data type="key" />

		</attribute>

	      </optional>

	      <element name="name" b:iv="name">

		<data type="string"/>

	      </element>

	      <element name="surname" b:iv="surname">

		<data type="string"/>

	      </element>

	      <optional>

		<element name="nick" b:iv="nick"><data type="string"/></element>

	      </optional>

	      <zeroOrMore>

		<element name="email" b:iv="emails" b:ivType="Set">

		  <data type="string"/>

		</element>

	      </zeroOrMore>

	    </group>

	  </choice>

	</element>	

      </oneOrMore>

    </element>

  </oneOrMore>

</element>