ZRender

ZRender objects implement the ZRenderer Proposal

• A ZRender object has attributes corresponding to the atttributes of the original tag.
• When called, it attempts to acquire the method named by the z-render attribute. If this fails, either an exception is raised or the original tag is inserted.
• The object pushes itself onto the namespace stack and calls the acquired method.
• The return value of this method is passed through to the ZRender object's caller.
• The ZRender object exposes methods to manipulate its attributes, and has a __str__ method which represents the object as a tag with the current attributes.