Re: [dataspace-protocol-base-dev] Question: About extending the control

[José Cantera <jose.cantera@xxxxxxxx>]

Hello,

Thanks for the feedback. There are two questions here though:

1/ Is my example an appropriate usage of the Control Plane, and the response is probably not

2/ is it a good practice to extend Transfer Messages? And here my thought is, given that a Data Transfer Profile can be defined in terms of essentially  a format, then a particular format may require extra properties to be incorporated to the transfer messages (that would be expressed in a custom Vocabulary) … However I am seeing that the schemas in the repo do not allow for additionalProperties … 

More feedback welcome

Thank you very much

All the best

On 27 Nov 2025, at 00:15, Jim Marino <jim.marino@xxxxxxxxx> wrote:

Hello,

The role of the TransferProcessRequest is to initiate a data transfer that happens out-of-band in the data plane. How the data is transferred - including filtering - should be done via the wire protocol of the data plane. For example, a REST API, subject filtering in a messaging system, etc. 

Extending a DSP message with custom properties is not interoperable and generally indicates a design issue.

Jim  

On Nov 26, 2025 at 5:40:14 PM, José Cantera via dataspace-protocol-base-dev <dataspace-protocol-base-dev@xxxxxxxxxxx> wrote:

Dear all,

This is a question on how to properly design a Data Transfer Profile and to gather experiences you may have had. So I am not proposing any new feature for the protocol at the moment. 

Do you think it could be a good idea to extend the `TransferRequestMessage` to specify upfront filtering conditions over the dataset you want to pull or push data? 

Example: I want all the entities in the dataset that match the filter and I request the transfer of only those. See below.

Is this a proper usage of the Control Plane? Or should the filtering query only be specified through the data plane once the transfer has been set ? 

Thank you very much for your thoughts and feedback

All the best

{

"@context": [

"https://w3id.org/dspace/2025/1/context.jsonld",

"https://schema.twindev.org/dspace/types.jsonld"

],

"@type": "TransferRequestMessage",

"agreementId": "urn:uuid:27c4289f-36f1-4eb4-8fc9-8986be3d6e03",

"consumerPid": "urn:uuid:48a5e643-8772-4bbb-a5c9-1f1318ced42d",

"format": "Http-Pull-Query-Format",

"callbackAddress": "https://callback.example.org/consumer1",

"filter": {

"@type": "EntityFiltering",

"q": "destinationCountry == ES OR destinationCountry == PL"

}

}

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