<?xml version="1.0"?>
<rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0"
       startMode="camera">
     <mode name="camera">
         <namespace ns="http://www.camera.org">
             <validate schema="Camera.xsd"
                       useMode="vendors" />
         </namespace>
     </mode>
     <mode name="vendors">
         <namespace ns="http://www.nikon.com">
             <attach />
         </namespace>
         <namespace ns="http://www.olympus.com">
             <attach />
         </namespace>
         <namespace ns="http://www.pentax.com">
             <attach />
         </namespace>
     </mode>
</rules>