@staticmethod

	def create(s,start):

		assert Property.fits(s,start)

		res=Property()

		i,res.name=Property.ident(s,start)

		i=skipWhitespace(s,i)

		i,x=Property.createValue(s,i,res.name)

		res.value=x

		i=skipWhitespace(s,i)

		return (i,res)

	@staticmethod

	def ident(s,start):

		m=Property.identRegexp.match(s,start)

		if m is None: raise ParserError("expected a property identifier matching '[A-Z]+'",s,start)

		return (m.end(),m.group())

	@staticmethod

	def createValue(s,start,name):

		if name in Property.patterns:

			return Property.patterns[name](s,start)

		else:

			# !! raise or log or ignore

			# print('warning, unknown property "{0}" at position {1}'.format(name,start))

	@property

	def type(self):

		gameInfo={"AN","BR","BT","CP","DT","EV","GN","GC","ON","OT","PB","PC","PW","RE","RO","RU","SO","TM","US","WR","WT"}

		if self.name in gameInfo: return GAME_INFO

		else: return UNKNOWN

	def copy(self):

		res=Property()

		res.name=self.name

		res.value=self.value if not isinstance(self.value,list) else self.value[:]

		return res

	def __str__(self):

		val="[{0}]".format(self.value) if not isinstance(self.value,list) else "".join("[{0}]".format(x) for x in self.value)

		return "{0}{1}".format(self.name,val)

	patterns={

		"B":singleton(move),

		"KO":singleton(empty),

		"MN":singleton(number),

		"W":singleton(move),

		"AB":listOf(stone), #

		"AE":listOf(point), #