diff --git a/src/sgfParser/property.py b/src/sgfParser/property.py
--- a/src/sgfParser/property.py
+++ b/src/sgfParser/property.py
@@ -5,39 +5,6 @@ GAME_INFO=1
 UNKNOWN=99
 
 
-class Property:
-	def __init__(self):
-		self.name=""
-		self.value=""
-
-	@staticmethod
-	def create(s,start):
-		res=Property()
-		i,x=Property.ident(s,start)
-		if x is None:
-			return (start,None)
-		res.name=x
-		i,x=PropValue.create(s,i,res.name)
-		if x is None:
-			print('error when parsing property "{0}" at position {1}'.format(res.name,i))
-			return (start,None)
-		res.value=x
-		return (i,res)
-
-	@staticmethod
-	def ident(s,start):
-		r=re.compile(r"[A-Z]+")
-		m=r.match(s,start)
-		if m is None: return (start,None)
-		return (m.end(),m.group())
-
-	@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 choose(*vTypes):
 	def f(s,start):
 		for vType in vTypes:
@@ -149,6 +116,7 @@ def anything(s,start):
 		elif c=="]": break
 	return (i,s[start:i])
 
+
 # go specific
 def point(s,start):
 	r=re.compile(r"[a-zA-Z]{2}|") # !! limit to board size
@@ -166,19 +134,53 @@ move=point
 stone=point
 
 
-class PropValue:
+class Property:
 	def __init__(self):
-		self.type=""
-		self.value=None
+		self.name=""
+		self.value=""
 
 	@staticmethod
-	def create(s,start,name):
-		if name in PropValue.patterns:
-			return PropValue.patterns[name](s,start)
+	def create(s,start):
+		res=Property()
+		i,x=Property.ident(s,start)
+		if x is None:
+			return (start,None)
+		res.name=x
+		i,x=Property.createValue(s,i,res.name)
+		if x is None:
+			print('error when parsing property "{0}" at position {1}'.format(res.name,i))
+			return (start,None)
+		res.value=x
+		return (i,res)
+
+	@staticmethod
+	def ident(s,start):
+		r=re.compile(r"[A-Z]+")
+		m=r.match(s,start)
+		if m is None: return (start,None)
+		return (m.end(),m.group())
+
+	@staticmethod
+	def createValue(s,start,name):
+		if name in Property.patterns:
+			return Property.patterns[name](s,start)
 		else:
 			print('warning, unknown property "{0}" at position {1}'.format(name,start))
 			return singleton(anything)(s,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
+		# !! wouldn't work for listOf(listOf())
+		res.value=self.value if not isinstance(self.value,list) else self.value[:]
+		return res
+
 	patterns={
 		"B":singleton(move),
 		"KO":singleton(empty),
@@ -252,5 +254,4 @@ class PropValue:
 	}
 
 
-# TODO:
-# date
+# !! TODO: date