--- a/src/catedit/utils.py	Fri Apr 17 11:45:08 2015 +0200
+++ b/src/catedit/utils.py	Fri Apr 17 15:49:08 2015 +0200
@@ -10,6 +10,7 @@
 from flask import session
 from rdflib import RDF, RDFS, URIRef
 from rdflib.compare import to_isomorphic, graph_diff
+from rdflib.namespace import split_uri
 
 from flask.ext.github import GitHubError
 
@@ -48,7 +49,7 @@
     compare_result["same_content"] = (
         first_iso_cat == second_iso_cat
     )
-
+    
     if not(compare_result["same_content"]) and with_details:
         rdf_in_both = []
         rdf_only_in_first = []
@@ -69,6 +70,7 @@
                 (in_second, rdf_only_in_second)
         ]:
             for triple in diff_list.triples((None, None, None)):
+                logger.debug(triple)
                 if triple[1] == RDFS.label:
                     final_list.append(("label", triple[2].toPython()))
                 elif triple[1] == RDF.Description:
@@ -90,12 +92,20 @@
                                     )
                                 )
                             else:
-                                final_list.append(
-                                    (
-                                        predicate,
-                                        triple[2].toPython().split("#", 1)[1]
+                                can_append = True
+                                try: 
+                                    namespace, _ = split_uri(triple[2])
+                                    if namespace != app.config["CATEGORY_NAMESPACE"]:
+                                        can_append = False
+                                except:
+                                    can_append = False
+                                if can_append:
+                                    final_list.append(
+                                        (
+                                            predicate,
+                                            split_uri(triple[2])[1]
+                                        )
                                     )
-                                )
         compare_result["only_in_first"] = in_first
         compare_result["only_in_second"] = in_second
         compare_result["in_both"] = in_both

--- a/src/catedit/views/categories.py	Fri Apr 17 11:45:08 2015 +0200
+++ b/src/catedit/views/categories.py	Fri Apr 17 15:49:08 2015 +0200
@@ -14,6 +14,7 @@
 
 from flask import render_template, request, redirect, url_for, abort, Blueprint
 from rdflib import Graph
+from rdflib.namespace import split_uri
 
 from catedit.views.forms import CommitForm, CategoryForm
 
@@ -299,9 +300,11 @@
             for (cat_predicate, cat_object) in current_cat_properties:
                 can_append = True
                 if get_property_list()[repository][cat_predicate.toPython()]["object_type"] == "uriref-category":             
-                    if "#" in cat_object:
-                        namespace, object_id = cat_object.split("#", 1)
-                    else:
+                    try: 
+                        namespace, object_id = split_uri(cat_object)
+                        if namespace != app.config["CATEGORY_NAMESPACE"]:
+                            can_append = False
+                    except:
                         can_append = False
                 else:
                     object_id = cat_object

--- a/src/catedit/views/social.py	Fri Apr 17 11:45:08 2015 +0200
+++ b/src/catedit/views/social.py	Fri Apr 17 15:49:08 2015 +0200
@@ -159,7 +159,6 @@
     }
 
     changes_details = None
-    print(str(details_cat_id))
     if details_cat_id is not None:
         if (
         details_cat_id not in [category.cat_id