<element name=“base” xmlns=“relaxng.org/ns/structure/1.0”>
<choice> <group> <element name="data"> <value>firstValue</value> </element> <oneOrMore> <element name="option"> <element name="value"> <text/> </element> <element name="label"> <text/> </element> </element> </oneOrMore> </group> <group> <element name="data"> <value>secondValue</value> </element> <oneOrMore> <element name="option"> <element name="value"> <text/> </element> <element name="label"> <text/> </element> </element> </oneOrMore> </group> </choice>
</element>