<?xml version="1.0"?>
<rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0"
       startMode="rdf">
     <mode name="rdf">
         <namespace ns="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
             <validate schema="rdf.xsd"
                       useMode="river" />
         </namespace>
     </mode>
     <mode name="river">
         <namespace ns="http://www.geodesy.org/river#">
             <validate schema="river.xsd" />
             <attach />
         </namespace>
     </mode>
</rules>