dom3 ascontentmodel asobject as_unbounded integer.max_value as_sequence as_choice as_all as_none getlistoperator setlistoperator listoperator getminoccurs setminoccurs minoccurs getmaxoccurs setmaxoccurs maxoccurs asobjectlist getsubmodels setsubmodels asobjectlist submodels removesubmodel asobject oldnode insertsubmodel asobject newnode domasexception appendsubmodel asobject newnode domasexception