I propose:
A package NVR identifier is name-version-release - three fields separated by '-' characters.
The release field MUST NOT contain a '-' character.The version field MUST begin with a digit. Well-behaved parsers should allow it to contain '-' characters, but package creators should try to avoid this because it can lead to NVRs that look confusing.
The name field may contain '-' characters, EXCEPT that it MUST NOT contain a '-' character immediately followed by a digit.
Max.
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