Ability to hook into page events using a page service?

[mbice]

Hi,

We often build web parts that read from the current page properties. It would be nice to be able to hook into a page service and subscribe to field update events so we can re-render our web parts when fields/properties are updated.

I can see the out-of-the-box page properties web part doing this using a page service of some kind, but I can't find any documentation so it looks like these are internal methods not for public use.

If there's an existing way to do this, is there documentation anywhere describing how to subscribe a web part to a page field update? If not, is there any plan to expose a page service we could eventually use in our web parts to detect when the current page has been updated?

Thanks!