fixes bug: recursive setting of mediaType

ckanext/odsh/profiles/odsh_european_dcatap_profile.py

@@ -59,7 +59,7 @@ class ODSHEuropeanDCATAPProfile(EuropeanDCATAPProfile):
             # set dcat:mediaType
             for s2, p2, o2 in self.g.triples((s, DCAT['mediaType'], None)):
                 mediaType = o2.decode()
-                if mediaType:
+                if mediaType and not mediaType.startswith(IANA_MEDIA_TYPES):
                     self.g.set(
                         (s, DCAT['mediaType'], rdflib.URIRef(IANA_MEDIA_TYPES[mediaType]))
                     )