docs: private boolean overridesNamespaceMappings( JcrSession session ) {
          NamespaceRegistry registry = session.context().getNamespaceRegistry();
          if (registry instanceof LocalNamespaceRegistry) {
              Set<Namespace> localNamespaces = ((LocalNamespaceRegistry)registry).getLocalNamespaces();
              if (localNamespaces.isEmpty()) {
                  // There are no local mappings ...
                  return false;
              }
              for (Namespace namespace : localNamespaces) {
                  if (prefixesByUris.containsKey(namespace.getNamespaceUri())) return true;
              }
              // None of the local namespace mappings overrode any namespaces used by this schemata ...
              return false;
          }
          // We can't find the local mappings, so brute-force it ...
          for (Namespace namespace : registry.getNamespaces()) {
              String expectedPrefix = prefixesByUris.get(namespace.getNamespaceUri());
              if (expectedPrefix == null) {
                  // This namespace is not used by this schemata ...
                  continue;
              }
              if (!namespace.getPrefix().equals(expectedPrefix)) return true;
          }
          return false;
      }