Re: Question

[James Clark <jjc@jclark.com>]

Another big difference is that W3C XML Schemas takes concepts from OO
programming languages and tries to apply them to schemas for XML, whereas
RELAX NG does not.

----- Original Message -----
From: "Michael Fitzgerald" <mike@wyeast.net>
To: "Samuel Cheung" <SCheung@Novarra.com>
Cc: <relax-ng-comment@lists.oasis-open.org>
Sent: Tuesday, August 28, 2001 8:56 AM
Subject: RE: Question


> Sam,
>
> Yes, they are both languages that validate XML documents using XML syntax.
> Further, while I do not speak for the RELAX NG TC, I offer just a few
> observations.
>
> I compare XML Schema to a stretch limousine with a hot tub and bullet
proof
> glass while I compare RELAX NG to a classic, rag top sports car. Some are
> perhaps less generous about XML Schema than I, and I admit my comparison
may
> be less accurate and informed than theirs.
>
> IMHO, RELAX NG:
>
> - has a simpler syntax than XML Schema (compare an XML Schema element and
> complexType definition [http://www.w3.org/TR/xmlschema-0/] to RELAX NG's
far
> simpler element definition
> [http://www.oasis-open.org/committees/relax-ng/tutorial-20010810.html])
>
> - is more intuitive and easier to learn than XML Schema because it's
syntax
> is simpler
>
> - is modular thus allowing implementations that are simpler yet
conforming,
> based on implementer's choice
>
> - is more soundly based on time-tested data models from good, old computer
> science [http://www.cobase.cs.ucla.edu/tech-docs/dongwon/mura0619.pdf]
>
> - easily accepts elements from foreign namespaces, making it more flexible
> and adaptable to varied needs than XML Schema
>
> - accepts, per implementation, datatype libraries from foreign namespaces,
> such as XML Schema Part 2 [http://www.w3.org/tr/xmlschema-2/] or any other
> datatype library an implementer may choose or create. In fact, RELAX NG
does
> not require implementer's datatypes beyond the built-in types string and
> token.
>
> - is easy to believe in because it is based largely on the earlier works
of
> James Clark (TREX) and Murata Makoto (Relax), two  smart, nice guys who
were
> on the orginal W3C XML WG (James as technical lead) and have sacrificed
> their egos for the greater good (no patronizing intended)
>
> - is downright fun
>
> If anyone would like to improve on or beat up on this comparison, by all
> means, let's hear from you.
>
> Mike
> =====
> Wy'east Communications     http://www.wyeast.net
mailto:mike@wyeast.net
>
> Samuel Cheung wrote:
>
> >I am new to RELAX NG. Would someone please tell me what is the main
> >difference between RELAX NG and XML Schema? They are both XML based
> >schema for validating XML documents. Am I correct?
> >
> >Thanks,
> >
> >Sam
>
>
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