require "relaton-core"
pubid_first = Identifier.parse("ISO 1:1999")
pubid_second = Identifier.parse("ISO 1")
pubid_first == pubid_second
=> false
pubid_first.exclude(:year) == pubid_second
=> truerequire "pubid-core"
pubid = Identifier.parse("ISO 1:1999")
pubid.to_h
=> { publisher: "ISO", number: 1, year: 1999 }