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RE: XSD 1.1 versus the tandem of XSD 1.0 plus Schematron

• From: "Len Bullard" <Len.Bullard@ses-i.com>
• To: "Costello, Roger L." <costello@mitre.org>,<xml-dev@l...>
• Date: Wed, 15 Aug 2012 15:31:49 -0500

Nice.  I can't vouch for how accurate it is since my current use of XML
Schema is limited.

However, one might ask if for equivalent expressibility there are also
qualities of ease of expression and operational/maintenance cost?

IOW whereas existing installation and current training have associated
cost savings, over time these diminish relative to new training and
maintenance for new systems and personnel.  If the same expression can
be created and maintained in XML Schema 1.1 with less cost and higher
quality (with complexity comes mistakes) then they are not equivalent
options even if logically equivalent.  Also, given two or more
communicating parties using separate but equal schema, can you prove
they are expression-wise equivalent?

Again, finding old people and the cost of the insurance pool for keeping
them is an unintended consequence of entrenchment.  Caveat emptor.

len

-----Original Message-----
From: Costello, Roger L. [mailto:costello@mitre.org] 
Sent: Wednesday, August 15, 2012 3:18 PM
To: xml-dev@lists.xml.org
Subject:  XSD 1.1 versus the tandem of XSD 1.0 plus Schematron

Hi Folks,

XML Schema 1.1 has twenty-one new capabilities. 

How do those new capabilities stack up against a tandem of 1.0 and
Schematron? Can the new capabilities be implemented using the existing
1.0 schema technology plus Schematron?

It is an important question. Organizations are well entrenched in their
1.0 XSDs plus their Schematron schemas. They have invested heavily in
these technologies. And they have expertise in these technologies. And
there is good support for these technologies.

So what is the benefit of switching to XSD 1.1? Will it provide more
capabilities than the existing tandem of XSD 1.0 and Schematron?

This paper attempts to shed some light on these questions.

Here is a Venn Diagram. The left circle is XSD 1.1. The right circle is
XSD 1.0 plus Schematron. The new capabilities in XML Schema 1.1 are
shown. If the new capability can be equivalently expressed using a
tandem of XSD 1.0 plus Schematron then it is in the intersection. If the
new capability cannot be equivalently expressed then it is to the left,
exclusively in the XSD 1.1 circle. Capabilities that are unique to XSD
1.0 plus Schematron are to the right, exclusively in the XSD 1.0 plus
Schematron circle.


More ...
http://www.xfront.com/Overlap-between-XML-Schema-1-1-and-XML-Schema-1-0-
Plus-Schematron.pdf

Comments?

/Roger

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• References:
  • XSD 1.1 versus the tandem of XSD 1.0 plus Schematron
    • From: "Costello, Roger L." <costello@mitre.org>