# XV-CZ-16

Source: https://xmlvalid.com/rules/XV-CZ-16

> The Czech VAT number (DIČ) '…' is not CZ followed by eight to ten digits.

- Level: warning
- Rule sets: ISDOC amounts and identifiers Standard ISDOC 6.0.2
- Context: `isdoc:Party[isdoc:PostalAddress/isdoc:Country/isdoc:IdentificationCode = 'CZ']`
- Test: `not(starts-with($dic, 'CZ')) or matches($dic, '^CZ[0-9]{8,10}$')`

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