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XML Schema: What does <include schemaLocation="" /> mean?

• From: "Costello, Roger L." <costello@mitre.org>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Wed, 11 Mar 2020 11:30:04 +0000

Hi Folks,

Today, by accident, I omitted the value of schemaLocation in an xs:include, i.e.,

    <xs:include schemaLocation="" />

The Oxygen tool put a red squiggly line under it, to alert me. When I hovered my mouse over it, I got this (Saxon) warning message: 

    MySchema.xsd recursively includes itself

Interesting!

Given that the message was a warning and not an error, I conclude that it is legal for a schema file to include itself. Neat! Is there a use case for doing so? 

/Roger

• Follow-Ups:
  • Re: XML Schema: What does <include schemaLocation="" /> mean?
    • From: Mukul Gandhi <gandhi.mukul@gmail.com>