The following describes the syntactic constraints for PIDs in normalized form. The only differences with non-normalized PIDs are that the colon delimiter may be encoded as "%3a" or "%3A", and hex-digits may use lowercase [a-f].
PID: Length : maximum 64 Syntax : namespace-id ":" object-id namespace-id: Syntax : ( [A-Z] / [a-z] / [0-9] / "-" / "." ) 1+ object-id: Syntax : ( [A-Z] / [a-z] / [0-9] / "-" / "." / "~" / "_" / escaped-octet ) 1+ escaped-octet: Syntax : "%" hex-digit hex-digit hex-digit: Syntax : [0-9] / [A-F]@author Chris Wilper
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