Use https in schema.org namespace

Annoyingly, the croissant validator does not support the
http://schema.org namespace and insists on https

Ref https://schema.org/docs/faq.html#19

ckanext/dcat/profiles/croissant.py

@@ -8,6 +8,7 @@
 
 from dateutil.parser import parse as parse_date
 from rdflib import URIRef, BNode, Literal
+from rdflib.namespace import Namespace
 from ckantoolkit import url_for, config
 
 from ckanext.dcat.utils import resource_uri
@@ -16,9 +17,14 @@
     CR,
     DCT,
     RDF,
-    SCHEMA,
 )
 
+# The Croissant validator insists on https and will consider invalid
+# output that uses the http namespace
+
+SCHEMA = Namespace("https://schema.org/")
+
+
 class CroissantProfile(RDFProfile):
     """
     An RDF profile based on the schema.org Dataset, modified by Croissant.
@@ -360,4 +366,4 @@ def _resource_subresources_graph(self, dataset_ref, resource_ref, resource_dict)
                     ]
                     self._add_list_triples_from_dict(subresource_dict, subresource_ref, items)
 
-                self.g.add((subresource_ref, CR.containedIn, resource_ref))
+                self.g.add((subresource_ref, CR.containedIn, resource_ref))

ckanext/dcat/tests/profiles/croissant/test_validate.py

@@ -9,13 +9,15 @@
 
 def test_valid_output():
 
-    dataset_dict = json.loads(get_file_contents("ckan/ckan_full_dataset_croissant.json"))
+    dataset_dict = json.loads(
+        get_file_contents("ckan/ckan_full_dataset_croissant.json")
+    )
 
     s = RDFSerializer(profiles=["croissant"])
 
     s.graph_from_dataset(dataset_dict)
 
-    croissant_dict = s.g.serialize(format="json-ld")
+    croissant_dict = json.loads(s.g.serialize(format="json-ld", auto_compact=True))
 
     try:
         mlc.Dataset(croissant_dict)

examples/ckan/ckan_full_dataset_croissant.json

@@ -6,7 +6,7 @@
     "id_given": "my-custom-id",
     "is_live_dataset": true,
     "url": "http://example.org/ds1",
-    "version": "1.0b",
+    "version": "1.0.0",
     "tags": [
         {
             "name": "Tag 1"