<ref name="memory"/>
<ref name="disk_space"/>
<optional>
- <ref name="request"/>
+ <ref name="euca_instances"/>
</optional>
<optional>
- <ref name="euca_instances"/>
+ <ref name="request"/>
</optional>
</element>
</define>
</attribute>
<ref name="state"/>
<ref name="public_dns"/>
- <ref name="keypair"/>
+ <optional>
+ <ref name="keypair"/>
+ </optional>
</element>
</define>
<define name="ipv4">