Message

A Party Identifier Scheme MUST be from the list of PEPPOL Party Identifiers described in the "PEPPOL Policy for using Identifiers".

Context
ubl:Enquiry/cac:RequestorParty/cac:PartyIdentification/cbc:ID
Test
matches(normalize-space(./@schemeID),'^(0((00[3-9])|(0[1-9]\d)|(1\d{2})|(20\d)|(21[0-3])))$')
Usage
/ t009:Enquiry / cac:RequestorParty / cac:PartyIdentification / cbc:ID / @schemeID