only in patch2:
unchanged:
--- a/core/modules/rdf/rdf.api.php
+++ b/core/modules/rdf/rdf.api.php
@@ -14,7 +14,7 @@
  * Allow modules to define namespaces for RDF mappings.
  *
  * Many common namespace prefixes are defined in rdf_rdf_namespaces(). However,
- * if a module implements hook_rdf_mapping() and uses a prefix that is not
+ * if a module implements rdf mappings that use prefixes that are not
  * defined in rdf_rdf_namespaces(), this hook should be used to define the new
  * namespace prefix.
  *