Message

MUST be a valid Norwegian organization number. Only numerical value allowed

Context
cbc:EndpointID[@schemeID = '0192'] | cac:PartyIdentification/cbc:ID[@schemeID = '0192'] | cbc:CompanyID[@schemeID = '0192']
Test
matches(normalize-space(), '^[0-9]{9}$') and u:mod11(normalize-space())