class ParameterObject:
	
	def __init__( self, sParameterName ):
		self.name = sParameterName
		self.value = True



class ParameterCollection:
	
	def __init__( self ):
		self.name = 'Parameters'
	
	def __call__( self, sParameterName ):
		
		if sParameterName == 'viewvis':
			return ParameterObject( sParameterName )
		else:
			return None




class PropertyObject:
	
	def __init__( self, sPropertyName ):
		self.name = sPropertyName
	
	def __getattr__( self, sAttribute ):
		
		if sAttribute == 'Parameters':
			return ParameterCollection()
		else:
			return None



class PropertyCollection:
	
	def __init__( self ):
		self.name = 'Properties'
	
	def __call__( self, sPropertyName ):
		
		"""
		Let's intercept the calls made to this instance.
		If the name used matches a set of predefined properties,
		return the corresponding class instance.
		"""
		
		if sPropertyName == 'visibility':
			return PropertyObject( sPropertyName )
		else:
			return None
	
	def __getitem__( self, i ):
		
		"""
		Let's do some loop over this instance!
		For each iteration, return a new instance of PropertyObject.
		"""
		
		return PropertyObject( aPROPERTIES[i] )




class X3DObject:
	
	def __init__( self ):
		
		self.name = 'object'
		self.type = 'polymsh'
	
	
	def __getattr__( self, sAttribute ):
		
		"""
		Let's intercept some of the attribute qualifications attempted on this instance.
		If these attributes match a set of predefined attributes,
		return the corresponding class instance.
		"""
		
		if sAttribute == 'Properties':
			# User is using "Properties", let's give him an instance
			return PropertyCollection()
		else:
			return None



oObject = X3DObject()
print oObject.Properties( 'visibility' ).name
print oObject.Properties( 'visibility' ).Parameters( 'viewvis' ).value