I have some properties auto-generated by a template that refer to characteristics of other pages of the same name in different namespaces.  For instance, for my TestPage, I want to set the property "Has condition reports" according to the presence of the Conditions:TestPage page and "Has last condition report update" according to the Modification date of Conditions:TestPage.  This is easy to do and works great a lot of the time.

But, when those linked pages change, the root page doesn't update its properties automatically.  So, if I have a link that creates Conditions:TestPage, clicking that link and creating the page doesn't change the "Has condition reports" page until I edit TestPage again.

Is there any way I can specify conditional updates?  I'd like TestPage to recompute its properties any time Conditions:TestPage is modified.