fix: restore the 6.1.1 default bound namespaces (#2313)

The namespaces bound by default by `rdflib.graph.Graph` and
`rdflib.namespace.NamespaceManager` was reduced in version 6.2.0 of RDFLib,
however, this also would cause code that worked with 6.1.1 to break, so this
constituted a breaking change. This change restores the previous behaviour,
binding the same namespaces as was bound in 6.1.1.

To bind a reduced set of namespaces, the `bind_namespaces` parameter of
`rdflib.graph.Graph` or `rdflib.namespace.NamespaceManager` can be used.

- Closes <https://github.com/RDFLib/rdflib/issues/2103>.

2 files changed, 13 insertions, 4 deletions

diff --git a/rdflib/graph.py b/rdflib/graph.py
index 7d32ab38..4a96e6d3 100644
--- a/rdflib/graph.py
+++ b/rdflib/graph.py
@@ -437,7 +437,7 @@ class Graph(Node):
         identifier: Optional[Union[_ContextIdentifierType, str]] = None,
         namespace_manager: Optional[NamespaceManager] = None,
         base: Optional[str] = None,
-        bind_namespaces: "_NamespaceSetString" = "core",
+        bind_namespaces: "_NamespaceSetString" = "rdflib",
     ):
         super(Graph, self).__init__()
         self.base = base
diff --git a/rdflib/namespace/__init__.py b/rdflib/namespace/__init__.py
index fb6d845b..c88fdedd 100644
--- a/rdflib/namespace/__init__.py
+++ b/rdflib/namespace/__init__.py
@@ -360,13 +360,13 @@ class NamespaceManager(object):
     * core:
         * binds several core RDF prefixes only
         * owl, rdf, rdfs, xsd, xml from the NAMESPACE_PREFIXES_CORE object
-        * this is default
     * 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, schema
         * sh, skos, sosa, ssn, time, vann, void
         * see the NAMESPACE_PREFIXES_RDFLIB object for the up-to-date list
+        * this is default
     * none:
         * binds no namespaces to prefixes
         * note this is NOT default behaviour
@@ -374,6 +374,14 @@ class NamespaceManager(object):
         * using prefix bindings from prefix.cc which is a online prefixes database
         * not implemented yet - this is aspirational
 
+    .. attention::
+
+        The namespaces bound for specific values of ``bind_namespaces``
+        constitute part of RDFLib's public interface, so changes to them should
+        only be additive within the same minor version. Removing values, or
+        removing namespaces that are bound by default, constitutes a breaking
+        change.
+
     See the
     Sample usage
 
@@ -390,10 +398,11 @@ class NamespaceManager(object):
         >>> all_ns = [n for n in g.namespace_manager.namespaces()]
         >>> assert ('ex', rdflib.term.URIRef('http://example.com/')) in all_ns
         >>>
-
     """
 
-    def __init__(self, graph: "Graph", bind_namespaces: "_NamespaceSetString" = "core"):
+    def __init__(
+        self, graph: "Graph", bind_namespaces: "_NamespaceSetString" = "rdflib"
+    ):
         self.graph = graph
         self.__cache: Dict[str, Tuple[str, URIRef, str]] = {}
         self.__cache_strict: Dict[str, Tuple[str, URIRef, str]] = {}