How to relate objects with schema.org which are on different pages?

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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.

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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.

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Schema.org has added a new sameAs property specifically for disambiguating entities in structured markup. http://schema.org/sameAs