Proposal: Add links to the SPDX 2.X equivalent properties and classes

[goneall]

In working on a utility to upgrade SPDX 2.X documents to SPDX 3.0, I need to come up with a mapping of equivalent properties and classes - specifically the URI's for those classes and properties.

In RDF, there is an owl:sameAs which I suggest we use to correlate the SPDX 3.0 terms to SPDX 2.X. This should only be used if the classes and or properties are semantically the same.

The proposal is to add an additional metadata to the markdown for classes and properties with the value being the SPDX 2.X URI.

In the spec parser, we would translate that metadata to an owl:sameAs property on the SPDX 3 class or property shape.

Propsed metadata term: Spdx2Uri:

[goneall]

Discussed on tech call 4 June:

• Agree not to use owl:sameAs - since the classes have different properties and are not technically the same
• Could use owl:seeAlso - which references the previous version
• Not much value having it in RDF
• Proposal to have a JSON file either generated or hand maintained
• There may be value in capturing this in the generated website
• JSON format should be "pretty"
• Start JSON format - put it in the spec repo

[goneall]

Transferring to the spec repo since we agreed we will not maintain the mappings there and not in the model repo

[goneall]

Moving over to the 3.1 milestone. It's quite a bit of work, so we need some volunteers.