I completed a line by line comparison of the SPDX 2.2 UML model with the current SBOM model. A draft of the results of the analysis are here: https://docs.google.com/document/d/1s4TQN6DgfF6rup_5aQbySQpVrdaaK24ngnRmwqsmmXs/edit?usp=sharing
Feel free to review and comment.
I realize the document may not be very clear in places – it was taking me a lot more time than I had budgeted for the exercise and I thought it would be better to just get out something of a draft rather than waiting until it was more polished.
I found a number of incompatibilities; many were minor differences in the choice of attribute names and a few of there were more structural.
I summarized proposals for both changes to the SBOM model and the SPDX model at the beginning of the document. All proposals are related to making the 2 models compatible in SPDX 3.0. There are 31 proposed changes to the SBOM and 13 proposed changes to SPDX. Since it is easier to change an unpublished standard than to create incompatibilities in existing documents and tools, I leaned more toward changes in the SBOM than changes in SPDX. Please note that these proposals are my own and do not reflect the opinions of the SPDX community as a whole. It is likely that these changes will require quite a bit of discussion within the SPDX community and may results in changes or counter-proposals.
There are a couple of categories of changes I would like to highlight:
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