How can I indicate that the resources described with a CMDI file are also searchable via a specialised web application?

This can be done with a ResourceProxy where:

ResourceType = SearchPage

e.g.:


 <ResourceProxy id="d55">
   <ResourceType>SearchPage</ResourceType>
   <ResourceRef>http://corpus1.mpi.nl/ds/trova/search.jsp?nodeid=MPI86949%23</ResourceRef>
 </ResourceProxy>

For a complete example file see: http://catalog.clarin.eu/metadata/cmdi/collections/collection-cgn.cmdi