returns the filter operation . concode_field_sep Filter filter concode_elem_sep Filter INTERSECT concode_elem_sep String expression concode_elem_sep Map<String,String> nsMap concode_elem_sep Filter SUBTRACT concode_elem_sep String operation concode_elem_sep Filter UNION concode_field_sep String getExpression concode_elem_sep String toString concode_elem_sep Map getNamespaceMap
Filter function ( ) { return filter ; }