# UBL-SR-51

Source: https://xmlvalid.com/rules/UBL-SR-51

> An address can only have one third line.

- Level: error
- Rule sets: EN 16931 rules (UBL) 1.3.17, EN 16931 rules 1.3.16 (UBL), EXTENDED-CTC-FR rules (UBL) 1.4.0.04
- Context: `//cac:PostalAddress | //cac:Address`
- Test: `not(cac:AddressLine) or count(cac:AddressLine) = 1`

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