question: whether str is ack concode_field_sep String ACK concode_elem_sep String OPTION concode_elem_sep String[] dialog_methods concode_elem_sep String INFO concode_elem_sep String BYE concode_elem_sep String INVITE concode_elem_sep String REGISTER concode_elem_sep String UPDATE concode_elem_sep String OPTIONS concode_elem_sep String CANCEL concode_elem_sep String[] methods concode_field_sep boolean isCancel concode_elem_sep boolean isOptions concode_elem_sep boolean same concode_elem_sep boolean isBye concode_elem_sep boolean isOption concode_elem_sep boolean isInvite concode_elem_sep boolean isInfo concode_elem_sep boolean isRegister concode_elem_sep boolean isUpdate
target: boolean function ( String arg0 ) { return same ( arg0 , ACK ) ; }