Key

Text identifier to be used instead of a code for a more verbose but readable identifier.

Schema ID

https://gobl.org/draft-0/cbc/key

Field	Test	Validation Code / Message
Key	Length between 1 and 64	`GOBL-CBC-KEY-01` Key must be between 1 and 64 characters long
Key	Matches `^(?:[a-z]\|[a-z0-9][a-z0-9-+]*[a-z0-9])$`	`GOBL-CBC-KEY-02` Key must match the required pattern