I am searching for a solution for my problem for days and I have still no Idea if it's possible or not.
I want to relate objects/things with schema.org and microdata notation like with RDFa and the about/rel attributes.
Example:
Page 1: www.mypage.com/page1
<span itemscope itemtype="http://schema.org/Corporation" itemid="http://www.freebase.com/view/m/XYZ">
... some information
Page 2: www.mypage.com/page2
<div itemscope itemtype="http://schema.org/Corporation" itemid="http://www.freebase.com/view/m/0ckzqsj">
... some businessevents
Is there any chance to tell a validator to merge the information of those two items? As far as I know, itemref is not the right way to accomplish that (How do I relate items in schema.org?)
As far as i rememeber I read something about the @url attribute which can be used to achieve something like that.
Using the same itemid for both items is the correct way to say that they are both describing different properties of the same "thing". However, I don't think that search engines currently display aggregated data like this.