[Zope] PythonMethod and accessing objects in the ZODB

I'm using the PythonMethod product (latest Version) and Zope2.2.2. The method lives inside a ZClass, which has an common instance propertysheet. Also the method gets an 'self' as argument. Question 1: How do i access the attributes stored within this propertysheet within the method, while self.title and self.id gives the desired results. self.propertysheet.propertyname (among other experiments) raises an error. Question 2: How do I access objects stored elsewhere in the ZODB, for example self.REQUEST....path_to_object.object will raise an error...... Thanks in advance. Hannes.