Jürgen Herrmann wrote:

btw. i'll learn to formulate my questions better...

the actual question way back then should have read (and not more): "who (which method) is responsible for delivering an ImageFile instances content when called, as index_html obviously is NOT called?"

The publisher chooses what method to publish, and it usually chooses index_html. You did something which made the publisher not do that... Chris -- Simplistix - Content Management, Zope & Python Consulting - http://www.simplistix.co.uk