code: public static String getRDFNamespaceForJcrNamespace(
              final String jcrNamespaceUri) {
          if (jcrNamespacesToRDFNamespaces.containsKey(jcrNamespaceUri)) {
              return jcrNamespacesToRDFNamespaces.get(jcrNamespaceUri);
          }
          return jcrNamespaceUri;
      }
docs: Convert a JCR namespace into an RDF namespace fit for downstream
  consumption.
  
  @param jcrNamespaceUri a namespace from the JCR NamespaceRegistry
  @return an RDF namespace for downstream consumption.