Change the content type based on the given format parameter.

nomad/app/dcat/catalog.py

@@ -73,7 +73,8 @@ class Catalog(Resource):
 
         mapping = Mapping()
         mapping.map_catalog(es_response.hits)
+        content_type = 'application/xml' if format_ == 'xml' else 'text/%s' % format_
 
         return Response(
             mapping.g.serialize(format=format_).decode('utf-8'), 200,
-            {'Content-Type': 'application/xml'})
+            {'Content-Type': content_type})

nomad/app/dcat/datasets.py

@@ -59,6 +59,7 @@ class Dataset(Resource):
 
         mapping = Mapping()
         mapping.map_entry(entry)
+        content_type = 'application/xml' if format_ == 'xml' else 'text/%s' % format_
         return Response(
             mapping.g.serialize(format=format_).decode('utf-8'), 200,
-            {'Content-Type': 'application/xml'})
+            {'Content-Type': content_type})