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