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Need to import the XML schema namespace

• From: Jeff Greif <jgreif@alumni.princeton.edu>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Wed, 05 May 2010 20:47:41 -0700

Most XML Schemas in the wild reference some of the types in the
http://www.w3.org/2001/XMLSchema namespace, but they usually do so
without explicitly importing it, so it apparently unnecessary in
practice, if not normatively.

I can't find any reference in the XML Schema 1.0 spec that says it is
either illegal or unnecessary to import this namespace, for example,
using xs:import.  Similarly, I can't find any further interoperability
guidelines on this subject in the WSI-Basic Profile 1.0.

Does anyone have a reference to a definitive statement of whether this
import is required, optional or forbidden in XML Schemas that reference
the data types of this namespace?

Jeff

• Follow-Ups:
  • RE: Need to import the XML schema namespace
    • From: "Michael Kay" <mike@saxonica.com>
  • Re: Need to import the XML schema namespace
    • From: Liam R E Quin <liam@w3.org>