<element name=“data” xmlns=“relaxng.org/ns/structure/1.0”>
<choice> <externalRef href="pattern1.rng"/> <externalRef href="pattern2.rng"/> </choice>
</element>
<element name=“data” xmlns=“relaxng.org/ns/structure/1.0”>
<choice> <externalRef href="pattern1.rng"/> <externalRef href="pattern2.rng"/> </choice>
</element>