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Hi,

as you correctly state, microdata does not offer a "rev" pattern for linking from an entity to an outside entity. Since the microdata processing rules for GoodRelations [1] specify that 

"Identity based on itemid: Two items with the same itemid represent the same conceptual entity and must be merged by GoodRelations processors. ..."

So you can put the following code anywhere on the page

<div itemscope itemtype="http://purl.org/goodrelations/v1#BusinessEntity"
     itemid="http://example.com/#company">
     <link itemprop="offers" href="#offer" />
</div>

This will link to the offer (gr:Offering, identified by itemid="#offer":

<div itemscope itemtype="http://purl.org/goodrelations/v1#Offering" itemid="#offer">
  <div itemprop="name">Hepp Personal SCSI Controller Card</div>
  <div itemprop="description">The Hepp Personal SCSI is a 16-bit 
add-on card that allows attaching up to seven SCSI devices to your computer.</div>
  <link itemprop="hasBusinessFunction" 
     href="http://purl.org/goodrelations/v1#Sell" />
  <div itemscope itemprop="hasPriceSpecification" 
       itemtype="http://purl.org/goodrelations/v1#UnitPriceSpecification">Price: 
    <meta itemprop="hasCurrency" content="USD">$
    <span itemprop="hasCurrencyValue">99.99</span>
    <time itemprop="validThrough" datetime="2012-11-30T23:59:59Z"></time> 
  </div>
</div>

Best

Martin Hepp

[1] http://www.heppnetz.de/ontologies/goodrelations/v1.html#microdata_specification
On Dec 31, 2011, at 3:41 PM, Özer Kavak wrote:

> Hi all,
> 
> on 
> http://wiki.goodrelations-vocabulary.org/Quickstart
> 
> <div about="#offering" typeof="gr:Offering">
> 
>   
> <div rev="gr:offers" resource="http://www.hepps-bagels.com/#company"></div>
> 
>   
> <div property="gr:name"
> 
>        
> content="Canon Rebel T2i (EOS 550D) $899" xml:lang="en"></div>
> 
> ...
> 
> code links the offer to the company.
> 
> How can i do it with microdata syntax? 
> i could not imagine usage of itemprop instead of rev
> 
> Thanks 
> özer
> _______________________________________________
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> goodrelations at ebusiness-unibw.org
> http://ebusiness-unibw.org/cgi-bin/mailman/listinfo/goodrelations

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[goodrelations] Linking from offers or products to the company with microdata