• From: Roger L Costello <costello@m...>
• To: "xml-dev@l..." <xml-dev@l...>
• Date: Wed, 21 Apr 2021 12:23:23 +0000

Hi Folks,

Is an XML Schema a constraint language? An XML Schema states constraints that must be satisfied by instances for them to be "valid". Determining if an instance is valid is a constraint satisfaction problem. 

Or, is an XML Schema a specification language? An XML Schema is a specification that informs instance document authors how to construct instances. Determining if an instance is valid is a matter of checking that the instance adheres to the specification.

/Roger

• Follow-Ups:
  • Re: Is XML Schema a constraint language or a specification language?
    • From: Mukul Gandhi <mukulg@s...>