Most GNU packages do not have a Release part, but how this is modeled in a PSF is described here anyway.
The Release part is analogous to the
RPMTAG_RELEASE and debian_revision attributes, hence GNU software
releases do no have this part because GNU packages are the original 'upstream' releases relative to the packages of
The Name becomes the product.tag attribute. The Revision becomes the product.revision attribute. The Release becomes the product.vendor_tag attribute.