<?xml version="1.0"?>
<rules startMode="planets"
       xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0">
   
    <mode name="planets">
        <namespace ns="http://www.planets.org">
            <validate schema="planets.xsd" 
                      useMode="metadata" />
        </namespace>
    </mode>
   
    <mode name="metadata">
        <namespace ns="http://purl.org/dc/elements/1.1/">
            <validate schema="dc.rng" />
        </namespace>
    </mode>

</rules>
