Incorporate PURL as id's #28
Description
Add info on purls (https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst#oci) as one means to identify externally persisted artifacts and evidence.
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Add info on purls (https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst#oci) as one means to identify externally persisted artifacts and evidence.