Plumbmsg: module{	PATH:	con "/dis/lib/plumbmsg.dis"; 	# Message format:	#	source application\n	#	destination application\n	#	working directory\n	#	type\n	#	properties\n	#	nbytes\n	#	n bytes 	Msg: adt	{		src:		string;		dst:		string;		dir:		string;		kind:		string;		attr:		string;		data:		array of byte; 		# used by applications		send: 	fn(msg: self ref Msg): int;		recv: 	fn(): ref Msg; 		# used by plumb and send, recv		pack: 	fn(msg: self ref Msg): array of byte;		unpack: 	fn(b: array of byte): ref Msg;	}; 	Attr: adt	{		name:	string;		val:		string;	}; 	init:	fn(doinput: int, rcvport: string, maxdata: int): int;	shutdown:	fn(); 	string2attrs:	fn(s: string): list of ref Attr;	attrs2string:	fn(l: list of ref Attr): string;	lookup:	fn(attrs: list of ref Attr, name: string): (int, string);};