[Zope-dev] Interface for renderable component

[Malthe Borch]

Currently a number of z3c.* packages rely on 
``zope.pagetemplate.interfaces.IPageTemplate`` even though they don't 
care at all that it's a template they're getting. All they need to know 
is that it's a callable and that it returns HTML.

I think it'd be a good idea to introduce the following interface that we 
can use instead:

   class IRenderer(Interface):
       def __call__(**kwargs):
           """Outputs HTML."""

This interface should be defined in a package with minimal dependencies.

\malthe