# PEPPOL-T19-B19201

Source: https://xmlvalid.com/rules/PEPPOL-T19-B19201

> Attribute 'schemeID' MUST be present.

- Level: error
- Rule sets: Peppol Catalogue rules 3.5
- Context: `/ubl:Catalogue/cac:CatalogueLine/cac:Item/cac:StandardItemIdentification/cbc:ID`
- Test: `@schemeID`

Validate a document against these rules: https://xmlvalid.com/validate