Forum OpenACS Development: Re: Modifying xowiki page content from a script
in the "stable branch", the best thing is to load the page instance (or FormPage) object, read/write the "instance_attributes", and call "save" on the object. This cares about everything. The cache-page from my last posting is quite convenient to see, what is stored where in these objects.
I am working on improved support for FormPages, but the best thing is to wait for the new stuff until the release in case you are working on a product.