SPDX and CycloneDX handle license expressions differently.
SPDX handles all licences in the same way regardless of whether it is an expression or not.
CycloneDX can include a license expression or one or more licences. Some SBOM generation tools are using multiple licences instead of an expression to indicate a logical AND of licences.
PROPOSAL (for CycloneDX)
If licence expression, always use SPDX Expression when generating
If multiple licenses, create SPDX Expression with logical AND between licenses when parsing
SPDX and CycloneDX handle license expressions differently.
SPDX handles all licences in the same way regardless of whether it is an expression or not.
CycloneDX can include a license expression or one or more licences. Some SBOM generation tools are using multiple licences instead of an expression to indicate a logical AND of licences.
PROPOSAL (for CycloneDX)
If licence expression, always use SPDX Expression when generating
If multiple licenses, create SPDX Expression with logical AND between licenses when parsing