Format - leading zeros, e,g, "026598741" - yes / no? Should we support both?
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Yes - we decided to include leading zeros. In addition, we added a constraint that validates the ID using the check digit:
matches('[0-9]{9}') and substring(8,1).toInteger()= (10-((substring(0,1).toInteger() + substring(1,1).toInteger()*2 mod 10 + substring(1,1).toInteger()*2 div 10 + substring(2,1).toInteger() + substring(3,1).toInteger()*2 mod 10 + substring(3,1).toInteger()*2 div 10 + substring(4,1).toInteger() + substring(5,1).toInteger()*2 mod 10 + substring(5,1).toInteger()*2 div 10 + substring(6,1).toInteger() + substring(7,1).toInteger()*2 mod 10 + substring(7,1).toInteger()*2 div 10) mod 10)) mod 10