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Hi Yves,

Simply define three instances of http://purl.org/goodrelations/v1#ProductOrServiceModel 
:

- one that holds the common super-product
- one for the download
- one for the CD

Then make the download and the CD gr:isVariantOf of the super product.

An RDF repository that uses the respective axioms from

   http://www.ebusiness-unibw.org/wiki/GoodRelationsOptionalAxiomsAndLinks

will then replicate all product properties from the super-product,  
unless they are defined differently at the level of the variant.

Note that this only holds for product properties, not for arbitrary  
RDF properties, so you would have to make them subproperties of
one of the three GR properties:
  gr:qualitativeProductOrServiceProperty
  gr:quantitativeProductOrServiceProperty
  gr:datatypeProductOrServiceProperty
A simpler solution is to model
- just one model,
- use two gr:Offerings of the same product, one for the download and  
one for the CD and one for the download, and
- indicate that the latter is a download by setting the delivery mode  
to http://purl.org/goodrelations/v1#DeliveryModeDirectDownload

If the price is the same you could also just model one model, one  
offering, and say that delivery is available via various parcel  
services and via gr:DeliveryModeDirectDownload.

Note that gr:isVariantOf is not strictly transitive (because of the  
defaults).

Best
Martin


On 15.10.2010, at 13:36, Yves Raimond wrote:

> Hello!
>
> I am trying to model several variants of a single product as Good
> Relations data. In my particular case, I have a particular audio
> record that can either be sold as an audio download or as a physical
> CD, both of which have very different prices and availabilities. How
> can I model this 'canonical' product (the audio record) and several
> variations/releases of it in Good Relations?
>
> Best,
> y
>
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