It should be possible to specify the identifier or identifiers for the party.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Identifier
udt:IdentifierType
Example value
987654321
Business terms
tir111-023
Attributes
Use Name Description
o @schemeID

Scheme identifier
Scheme identifier for party identification

Example value: 0192