diff --git a/csv2json.js b/csv2json.js
index a8f04a0..f6a2165 100644
--- a/csv2json.js
+++ b/csv2json.js
@@ -8,10 +8,10 @@ process.stdin
     for (let key in data) {
       if (data[key] === "") delete data[key]
     }
-    if ("id" in data) {
-      data.id = "http://data.nfdi4objects.net/collection/" + data.id
-        data.type = ["fabio:Database","dcat:Dataset"]
-    } else if ("wikidata" in data) {
+    if ("id" in data) {                 // collections = named graphs
+      data.id = "https://graph.nfdi4objects.net/collection/" + data.id
+      data.type = ["fabio:Database","dcat:Dataset"]
+    } else if ("wikidata" in data) {    // databases
       data.id = "http://www.wikidata.org/entity/" + data.id
       // TODO: type
     }
diff --git a/n4o-collections.json b/n4o-collections.json
index 9765563..2fbf740 100644
--- a/n4o-collections.json
+++ b/n4o-collections.json
@@ -1,107 +1,119 @@
 [
   {
-    "id": "http://data.nfdi4objects.net/collection/1",
+    "id": "https://graph.nfdi4objects.net/collection/1",
     "name": "Ur- und Frühgeschichtliche Sammlung der FAU",
     "url": "https://objekte-im-netz.fau.de/projekt/node/22",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/2",
+    "id": "https://graph.nfdi4objects.net/collection/2",
     "name": "Paläontologischen Sammlung der FAU|Geowissenschaftliche Sammlung der FAU",
     "url": "https://objekte-im-netz.fau.de/projekt/node/20",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/3",
+    "id": "https://graph.nfdi4objects.net/collection/3",
     "name": "Graphische Sammlung der FAU",
     "url": "https://objekte-im-netz.fau.de/projekt/node/17",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/4",
+    "id": "https://graph.nfdi4objects.net/collection/4",
     "name": "Musikinstrumentensammlung der FAU",
     "url": "https://objekte-im-netz.fau.de/projekt/node/19",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/5",
+    "id": "https://graph.nfdi4objects.net/collection/5",
     "name": "Medizinische Sammlung der FAU",
     "url": "https://objekte-im-netz.fau.de/projekt/node/18",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/6",
+    "id": "https://graph.nfdi4objects.net/collection/6",
     "name": "Schulgeschichtliche Sammlung der FAU und Schulmuseum",
     "url": "https://objekte-im-netz.fau.de/projekt/node/21",
     "db": "Q124695065",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/7",
+    "id": "https://graph.nfdi4objects.net/collection/7",
     "name": "KENOM Virtuelles Münzportal",
     "url": "http://www.kenom.de/",
     "db": "Q21040628",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/8",
+    "id": "https://graph.nfdi4objects.net/collection/8",
     "name": "Samian Research Database",
     "url": "https://rgzm.github.io/samian-lod/",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/9",
+    "id": "https://graph.nfdi4objects.net/collection/9",
     "name": "Linked Open Ogham",
     "url": "https://doi.org/10.5281/zenodo.4765603",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/10",
+    "id": "https://graph.nfdi4objects.net/collection/10",
     "name": "African Red Slip Ware",
     "url": "https://doi.org/10.5281/zenodo.5642751",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/11",
+    "id": "https://graph.nfdi4objects.net/collection/11",
     "name": "Digitale Sammlungen der Museen der Klassikstiftung Weimar",
     "url": "https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home",
     "db": "Q124536091",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   },
   {
-    "id": "http://data.nfdi4objects.net/collection/12",
+    "id": "https://graph.nfdi4objects.net/collection/12",
     "name": "Graphische Sammlung des Germanisches National Museum",
     "url": "https://www.gnm.de/sammlungen/sammlungen-a-z/graphische-sammlung",
     "db": "Q478695",
     "type": [
-      "fabio:Database"
+      "fabio:Database",
+      "dcat:Dataset"
     ]
   }
 ]
diff --git a/n4o-sources.nt b/n4o-sources.nt
index 81b7203..e412c6a 100644
--- a/n4o-sources.nt
+++ b/n4o-sources.nt
@@ -1,48 +1,60 @@
-<http://data.nfdi4objects.net/collection/10> <http://schema.org/name> "African Red Slip Ware" .
-<http://data.nfdi4objects.net/collection/10> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/10> <http://xmlns.com/foaf/0.1/homepage> <https://doi.org/10.5281/zenodo.5642751> .
-<http://data.nfdi4objects.net/collection/11> <http://schema.org/name> "Digitale Sammlungen der Museen der Klassikstiftung Weimar" .
-<http://data.nfdi4objects.net/collection/11> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/11> <http://xmlns.com/foaf/0.1/homepage> <https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home> .
-<http://data.nfdi4objects.net/collection/12> <http://schema.org/name> "Graphische Sammlung des Germanisches National Museum" .
-<http://data.nfdi4objects.net/collection/12> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/12> <http://xmlns.com/foaf/0.1/homepage> <https://www.gnm.de/sammlungen/sammlungen-a-z/graphische-sammlung> .
-<http://data.nfdi4objects.net/collection/1> <http://schema.org/name> "Ur- und Frühgeschichtliche Sammlung der FAU" .
-<http://data.nfdi4objects.net/collection/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/1> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/22> .
-<http://data.nfdi4objects.net/collection/2> <http://schema.org/name> "Paläontologischen Sammlung der FAU|Geowissenschaftliche Sammlung der FAU" .
-<http://data.nfdi4objects.net/collection/2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/2> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/20> .
-<http://data.nfdi4objects.net/collection/3> <http://schema.org/name> "Graphische Sammlung der FAU" .
-<http://data.nfdi4objects.net/collection/3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/3> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/17> .
-<http://data.nfdi4objects.net/collection/4> <http://schema.org/name> "Musikinstrumentensammlung der FAU" .
-<http://data.nfdi4objects.net/collection/4> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/4> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/19> .
-<http://data.nfdi4objects.net/collection/5> <http://schema.org/name> "Medizinische Sammlung der FAU" .
-<http://data.nfdi4objects.net/collection/5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/5> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/18> .
-<http://data.nfdi4objects.net/collection/6> <http://schema.org/name> "Schulgeschichtliche Sammlung der FAU und Schulmuseum" .
-<http://data.nfdi4objects.net/collection/6> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/6> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/21> .
-<http://data.nfdi4objects.net/collection/7> <http://schema.org/name> "KENOM Virtuelles Münzportal" .
-<http://data.nfdi4objects.net/collection/7> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/7> <http://xmlns.com/foaf/0.1/homepage> <http://www.kenom.de/> .
-<http://data.nfdi4objects.net/collection/8> <http://schema.org/name> "Samian Research Database" .
-<http://data.nfdi4objects.net/collection/8> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/8> <http://xmlns.com/foaf/0.1/homepage> <https://rgzm.github.io/samian-lod/> .
-<http://data.nfdi4objects.net/collection/9> <http://schema.org/name> "Linked Open Ogham" .
-<http://data.nfdi4objects.net/collection/9> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
-<http://data.nfdi4objects.net/collection/9> <http://xmlns.com/foaf/0.1/homepage> <https://doi.org/10.5281/zenodo.4765603> .
-<http://www.wikidata.org/entity/Q124536091> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/11> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/1> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/2> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/3> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/4> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/5> .
-<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/6> .
-<http://www.wikidata.org/entity/Q21040628> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/7> .
-<http://www.wikidata.org/entity/Q478695> <http://www.w3.org/ns/dcat#dataset> <http://data.nfdi4objects.net/collection/12> .
+<http://www.wikidata.org/entity/Q124536091> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/11> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/1> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/2> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/3> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/4> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/5> .
+<http://www.wikidata.org/entity/Q124695065> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/6> .
+<http://www.wikidata.org/entity/Q21040628> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/7> .
+<http://www.wikidata.org/entity/Q478695> <http://www.w3.org/ns/dcat#dataset> <https://graph.nfdi4objects.net/collection/12> .
+<https://graph.nfdi4objects.net/collection/10> <http://schema.org/name> "African Red Slip Ware" .
+<https://graph.nfdi4objects.net/collection/10> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/10> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/10> <http://xmlns.com/foaf/0.1/homepage> <https://doi.org/10.5281/zenodo.5642751> .
+<https://graph.nfdi4objects.net/collection/11> <http://schema.org/name> "Digitale Sammlungen der Museen der Klassikstiftung Weimar" .
+<https://graph.nfdi4objects.net/collection/11> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/11> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/11> <http://xmlns.com/foaf/0.1/homepage> <https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home> .
+<https://graph.nfdi4objects.net/collection/12> <http://schema.org/name> "Graphische Sammlung des Germanisches National Museum" .
+<https://graph.nfdi4objects.net/collection/12> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/12> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/12> <http://xmlns.com/foaf/0.1/homepage> <https://www.gnm.de/sammlungen/sammlungen-a-z/graphische-sammlung> .
+<https://graph.nfdi4objects.net/collection/1> <http://schema.org/name> "Ur- und Frühgeschichtliche Sammlung der FAU" .
+<https://graph.nfdi4objects.net/collection/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/1> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/22> .
+<https://graph.nfdi4objects.net/collection/2> <http://schema.org/name> "Paläontologischen Sammlung der FAU|Geowissenschaftliche Sammlung der FAU" .
+<https://graph.nfdi4objects.net/collection/2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/2> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/20> .
+<https://graph.nfdi4objects.net/collection/3> <http://schema.org/name> "Graphische Sammlung der FAU" .
+<https://graph.nfdi4objects.net/collection/3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/3> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/17> .
+<https://graph.nfdi4objects.net/collection/4> <http://schema.org/name> "Musikinstrumentensammlung der FAU" .
+<https://graph.nfdi4objects.net/collection/4> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/4> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/4> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/19> .
+<https://graph.nfdi4objects.net/collection/5> <http://schema.org/name> "Medizinische Sammlung der FAU" .
+<https://graph.nfdi4objects.net/collection/5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/5> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/18> .
+<https://graph.nfdi4objects.net/collection/6> <http://schema.org/name> "Schulgeschichtliche Sammlung der FAU und Schulmuseum" .
+<https://graph.nfdi4objects.net/collection/6> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/6> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/6> <http://xmlns.com/foaf/0.1/homepage> <https://objekte-im-netz.fau.de/projekt/node/21> .
+<https://graph.nfdi4objects.net/collection/7> <http://schema.org/name> "KENOM Virtuelles Münzportal" .
+<https://graph.nfdi4objects.net/collection/7> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/7> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/7> <http://xmlns.com/foaf/0.1/homepage> <http://www.kenom.de/> .
+<https://graph.nfdi4objects.net/collection/8> <http://schema.org/name> "Samian Research Database" .
+<https://graph.nfdi4objects.net/collection/8> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/8> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/8> <http://xmlns.com/foaf/0.1/homepage> <https://rgzm.github.io/samian-lod/> .
+<https://graph.nfdi4objects.net/collection/9> <http://schema.org/name> "Linked Open Ogham" .
+<https://graph.nfdi4objects.net/collection/9> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
+<https://graph.nfdi4objects.net/collection/9> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/dcat#Dataset> .
+<https://graph.nfdi4objects.net/collection/9> <http://xmlns.com/foaf/0.1/homepage> <https://doi.org/10.5281/zenodo.4765603> .
 
 <http://www.wikidata.org/entity/Q124504881> <http://schema.org/name> "montan.dok" .
 <http://www.wikidata.org/entity/Q124504881> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/spar/fabio/Database> .
diff --git a/n4o-sources.ttl b/n4o-sources.ttl
index 5bad735..ae8f11f 100644
--- a/n4o-sources.ttl
+++ b/n4o-sources.ttl
@@ -5,76 +5,76 @@
 @prefix owl: <http://www.w3.org/2002/07/owl#> .
 @prefix schema: <http://schema.org/> .
 @prefix wd: <http://www.wikidata.org/entity/> .
-@prefix n4oc: <http://data.nfdi4objects.net/collection/> .
+@prefix n4oc: <https://graph.nfdi4objects.net/collection/> .
 
-n4oc:10 a fabio:Database ;
-  schema:name "African Red Slip Ware" ;
-  foaf:homepage <https://doi.org/10.5281/zenodo.5642751> .
+wd:Q124536091 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
+  dcat:dataset n4oc:11 ;
+  schema:name "Digitale Sammlungen der Museen der Klassikstiftung Weimar" ;
+  foaf:homepage <https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home> .
 
-n4oc:11 a fabio:Database ;
+n4oc:11 a fabio:Database, dcat:Dataset ;
   schema:name "Digitale Sammlungen der Museen der Klassikstiftung Weimar" ;
   foaf:homepage <https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home> .
 
-n4oc:12 a fabio:Database ;
-  schema:name "Graphische Sammlung des Germanisches National Museum" ;
-  foaf:homepage <https://www.gnm.de/sammlungen/sammlungen-a-z/graphische-sammlung> .
+wd:Q124695065 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
+  dcat:dataset n4oc:1, n4oc:2, n4oc:3, n4oc:4, n4oc:5, n4oc:6 ;
+  schema:name "Objekte im Netz" ;
+  foaf:homepage <https://objekte-im-netz.fau.de/> .
 
-n4oc:1 a fabio:Database ;
+n4oc:1 a fabio:Database, dcat:Dataset ;
   schema:name "Ur- und Frühgeschichtliche Sammlung der FAU" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/22> .
 
-n4oc:2 a fabio:Database ;
+n4oc:2 a fabio:Database, dcat:Dataset ;
   schema:name "Paläontologischen Sammlung der FAU|Geowissenschaftliche Sammlung der FAU" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/20> .
 
-n4oc:3 a fabio:Database ;
+n4oc:3 a fabio:Database, dcat:Dataset ;
   schema:name "Graphische Sammlung der FAU" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/17> .
 
-n4oc:4 a fabio:Database ;
+n4oc:4 a fabio:Database, dcat:Dataset ;
   schema:name "Musikinstrumentensammlung der FAU" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/19> .
 
-n4oc:5 a fabio:Database ;
+n4oc:5 a fabio:Database, dcat:Dataset ;
   schema:name "Medizinische Sammlung der FAU" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/18> .
 
-n4oc:6 a fabio:Database ;
+n4oc:6 a fabio:Database, dcat:Dataset ;
   schema:name "Schulgeschichtliche Sammlung der FAU und Schulmuseum" ;
   foaf:homepage <https://objekte-im-netz.fau.de/projekt/node/21> .
 
-n4oc:7 a fabio:Database ;
-  schema:name "KENOM Virtuelles Münzportal" ;
-  foaf:homepage <http://www.kenom.de/> .
-
-n4oc:8 a fabio:Database ;
-  schema:name "Samian Research Database" ;
-  foaf:homepage <https://rgzm.github.io/samian-lod/> .
-
-n4oc:9 a fabio:Database ;
-  schema:name "Linked Open Ogham" ;
-  foaf:homepage <https://doi.org/10.5281/zenodo.4765603> .
-
-wd:Q124536091 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
-  schema:name "Digitale Sammlungen der Museen der Klassikstiftung Weimar" ;
-  foaf:homepage <https://ores.klassik-stiftung.de/ords/ksw_internet/r/300/home> ;
-  dcat:dataset n4oc:11 .
-
-wd:Q124695065 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
-  schema:name "Objekte im Netz" ;
-  foaf:homepage <https://objekte-im-netz.fau.de/> ;
-  dcat:dataset n4oc:1, n4oc:2, n4oc:3, n4oc:4, n4oc:5, n4oc:6 .
-
 wd:Q21040628 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
+  dcat:dataset n4oc:7 ;
   schema:name "KENOM" ;
   foaf:homepage <http://www.kenom.de> ;
-  dcat:dataset n4oc:7 ;
   dcat:distribution [
     dcat:accessURL "https://www.kenom.de/oai/"^^<http://www.w3.org/ns/dcat#anyURI>
   ] .
 
+n4oc:7 a fabio:Database, dcat:Dataset ;
+  schema:name "KENOM Virtuelles Münzportal" ;
+  foaf:homepage <http://www.kenom.de/> .
+
 wd:Q478695 dcat:dataset n4oc:12 .
 
+n4oc:12 a fabio:Database, dcat:Dataset ;
+  schema:name "Graphische Sammlung des Germanisches National Museum" ;
+  foaf:homepage <https://www.gnm.de/sammlungen/sammlungen-a-z/graphische-sammlung> .
+
+n4oc:10 a fabio:Database, dcat:Dataset ;
+  schema:name "African Red Slip Ware" ;
+  foaf:homepage <https://doi.org/10.5281/zenodo.5642751> .
+
+n4oc:8 a fabio:Database, dcat:Dataset ;
+  schema:name "Samian Research Database" ;
+  foaf:homepage <https://rgzm.github.io/samian-lod/> .
+
+n4oc:9 a fabio:Database, dcat:Dataset ;
+  schema:name "Linked Open Ogham" ;
+  foaf:homepage <https://doi.org/10.5281/zenodo.4765603> .
+
 wd:Q124504881 a fabio:Database, dcat:Catalog, nfdicore:DataPortal ;
   schema:name "montan.dok" ;
   foaf:homepage <https://www.montandok.de/> .
diff --git a/prefixes.json b/prefixes.json
index 67890e8..20ece6e 100644
--- a/prefixes.json
+++ b/prefixes.json
@@ -9,5 +9,5 @@
   "skos": "http://www.w3.org/2004/02/skos/core#",
   "xsd": "http://www.w3.org/2001/XMLSchema#",
   "wd": "http://www.wikidata.org/entity/",
-  "n4oc": "http://data.nfdi4objects.net/collection/"
+  "n4oc": "https://graph.nfdi4objects.net/collection/"
 }