fix: change the prefix for https://schema.org/ back to schema`

The default prefix for `https://schema.org/` registered with
`rdflib.namespace.NamespaceManager` was inadvertently changed to `sdo` in 6.2.0,
this however constitutes a breaking change, as code that was using the `schema`
prefix would no longer have the same behavior. This change changes the prefix
back to `schema`.

rdflib/namespace/__init__.py

@@ -364,8 +364,8 @@ class NamespaceManager(object):
     * rdflib:
         * binds all the namespaces shipped with RDFLib as DefinedNamespace instances
         * all the core namespaces and all the following: brick, csvw, dc, dcat
-        * dcmitype, dcterms, dcam, doap, foaf, geo, odrl, org, prof, prov, qb, sdo
-        * sh, skos, sosa, ssn, time, vann, void, wgs
+        * dcmitype, dcterms, dcam, doap, foaf, geo, odrl, org, prof, prov, qb, schema
+        * sh, skos, sosa, ssn, time, vann, void
         * see the NAMESPACE_PREFIXES_RDFLIB object for the up-to-date list
     * none:
         * binds no namespaces to prefixes
@@ -906,7 +906,7 @@ def get_longest_namespace(trie: Dict[str, Any], value: str) -> Optional[str]:
     "prof": PROF,
     "prov": PROV,
     "qb": QB,
-    "sdo": SDO,
+    "schema": SDO,
     "sh": SH,
     "skos": SKOS,
     "sosa": SOSA,

test/test_namespacemanager.py → test/test_namespace/test_namespacemanager.py

@@ -196,7 +196,7 @@ def test_nman_bind_namespaces(
                 "qb": "http://purl.org/linked-data/cube#",
                 "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
                 "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
-                "sdo": "https://schema.org/",
+                "schema": "https://schema.org/",
                 "sh": "http://www.w3.org/ns/shacl#",
                 "skos": "http://www.w3.org/2004/02/skos/core#",
                 "sosa": "http://www.w3.org/ns/sosa/",