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