code: function (prefix, namespace) {
        if (namespace === undefined) {
          return this.databank.prefix(prefix);
        } else {
          this.databank.prefix(prefix, namespace);
          return this;
        }
      }
docs: Sets or returns a namespace binding on the {@link jQuery.rdf#databank}.
  @param {String} [prefix]
  @param {String} [namespace]
  @returns {Object|jQuery.uri|jQuery.rdf} If no prefix or namespace is specified, returns an object providing all namespace bindings on the {@link jQuery.rdf.databank}. If a prefix is specified without a namespace, returns the {@link jQuery.uri} associated with that prefix. Otherwise returns this {@link jQuery.rdf} object after setting the namespace binding.
  @example namespace = jQuery('html').rdf().prefix('foaf');
  @example jQuery('html').rdf().prefix('foaf', 'http://xmlns.com/foaf/0.1/');
  @see jQuery.rdf.databank#prefix