Relationship between ContractOffer and Resource

[DominikPinsel]

Hello everyone,

I've got a question regarding the Resource and ContractOffer.

I'm assume that a Resource is the thing I want to exchange. For example if I have weather data for different cities, I would create a Resource object for each city. And this Resource then has it different Representations and Artifacts of the data. For me it gets confusing when I want to create a ContractOffer for the weather data of the 10 largest cities in Germany. The part I understand is that I now have create 10x Resource and 1x ContractOffer. But how do I represent the relationship between them?

• Is it correct to put the ContractOffer into each Ressource?
• Is it correct that the ContractOffer of one Resource may reference artifacts of other Resources?

_{Dominik Pinsel dominik.pinsel@daimler.com, Daimler TSS GmbH, legal info/Impressum}

[changqin26]

Is it correct to put the ContractOffer into each Ressource? Yes. You can reference a ContractOffer from the line 65 to 103 in a Resource template https://github.com/International-Data-Spaces-Association/InformationModel/blob/develop/examples/domain-specific-semantics-using-SHACL/TEMP_RESOURCE.ttl.

[changqin26]

Is it correct that the ContractOffer of one Resource may reference artifacts of other Resources? Yes. In IDS Infomodel, we use ids:target to point from one Rule inside a ContractOffer to its Resource artifact. The range of ids:target should be a URI representing either an Asset or an AssetCollection. When it is pointing to an AssetCollection, then it references not only one Resource but also other Resources.

[DominikPinsel]

@changqin26 Thanks for your reply. That's really interesting. I must say, that I never thought about AssetCollection IDs in Contracts until now. So to stay with the weather example. The best way to do this would be:

• Create 10x Resource for each city
• Create 1x AssetCollection, containing each Resource
• Create 1x ContractOffer, targeting the AssetCollection
• Put the ContractOffer into each Resource

_{Dominik Pinsel dominik.pinsel@daimler.com, Daimler TSS GmbH, legal info/Impressum}

[changqin26]

Yes, in this way, the content of the ContractOffer will apply to each Resource in the AssetCollection.

[DominikPinsel]

@changqin26 Perfect :) Then I've understood your explanation and will close this issue. Thanks a lot 👍

_{Dominik Pinsel dominik.pinsel@daimler.com, Daimler TSS GmbH, legal info/Impressum}