code: function(geometry) {
              var gml = this.createElementNS(this.gmlns, "gml:MultiLineString");
              var lines = geometry.components;
              var lineMember, lineGeom;
              for(var i=0; i<lines.length; ++i) {
                  lineMember = this.createElementNS(this.gmlns,
                                                    "gml:lineStringMember");
                  lineGeom = this.buildGeometry.linestring.apply(this,
                                                                     [lines[i]]);
                  lineMember.appendChild(lineGeom);
                  gml.appendChild(lineMember);
              }
              return gml;
          }
docs: Method: buildGeometry.multilinestring
  Given an OpenLayers multilinestring geometry, create a GML
  multilinestring.
  
  Parameters:
  geometry - {<OpenLayers.Geometry.MultiLineString>} A multilinestring
  geometry.
  
  Returns:
  {DOMElement} A GML multilinestring node.