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An e-invoicing routing/reference identifier, as described at https://leitweg-id.de/en/ and the format spec
provided there. A catalog of registered identifiers can be found there as well.
Validates format and and the checksum.
The state or federal government code is also validated as those values are included in the spec; validation to the level of the Kennzahl des Regierungsbezirks/Landkreises/Gemeindes is not included.