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Home » Boards » Stylus Studio Developer Network » XSLT Help and Discussion » what is meant by Backwards-Compatible Processing & Forwards-Compatible Processing in XSLT?
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(Deleted User) Subject: what is meant by Backwards-Compatible Processing & Forwards-Compatible Processing in XSLT?
Author: (Deleted User)
Date: 16 Jul 2007 09:08 AM
Originally Posted: 13 Jul 2007 09:07 AM
hi,

what does compatibility in xslt mean?

what is meant by Backwards-Compatible Processing & Forwards-Compatible Processing?

can anyone explain with an example.

Regards,
srinivas.
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James DurningSubject: what is meant by Backwards-Compatible Processing & Forwards-Compatible Processing in XSLT?
Author: James Durning
Date: 16 Jul 2007 11:48 AM
Backwards Compatible:
The element <xsl:transform> was removed from the specification and replaced with <xsl:stylesheet>

Processors which still allow <xsl:transform> are Backwards-Compatible with respect to this element. Processors which do not allow <xsl:transform> are not Backwards-Compatible, wrt this element.
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Tony LavinioSubject: what is meant by Backwards-Compatible Processing & Forwards-Compatible Processing in XSLT?
Author: Tony Lavinio
Date: 16 Jul 2007 04:00 PM
Well, it's more than just that.

XSLT 1.0 was designed so that to a great extent, stylesheets
written in future dialects would continue to run, even if the
behaviors in subsequent versions were to change.

See http://www.w3.org/TR/xslt#forwards

XSLT 2.0 was designed to allow switching behavior from 1.0
to 2.0 mode at the element level, to minimize disruptions
during upgrades. Backwards-compatible means it will run most
XSLT 1.0 stylesheets unchanged or with minimal changes. It
can even alter its behavior from the default 2.0 mode to a
1.0 mode locally.

See http://www.w3.org/TR/xslt20/#backwards

It also supports a forwards-compatibility mode. See
http://www.w3.org/TR/xslt20/#dt-forwards-compatible-behavior
   
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