RE: [xsl] XQuery 1.0 and XPath 2.0 Functions and Operators Version 1.0

Subject: RE: [xsl] XQuery 1.0 and XPath 2.0 Functions and Operators Version 1.0
From: Jim Melton <jim.melton@xxxxxxx>
Date: Thu, 06 Sep 2001 11:29:56 -0600

Thank you very much for your comments on the Functions and Operators document. Your thoughts on the tradeoffs of core document content versus additional libraries of functions are appreciated.

   Jim (one of the editors of F&O)

At 12:12 PM 9/6/2001 +0200 Thursday, Joerg Pietschmann wrote:
"Chris Bayes" <chris@xxxxxxxxxxx> wrote
> Well it is a good idea to keep it small I'd like to see xsl become all
> pervasive even to handheld devices as well as to mainframe database
> apps.
> As long as the extension mechanism is well defined and standard across
> all xslt 2.0 implementations then things like trig functions can be
> added as needed.

I'd rather have a small core functionality and some well defined,
standardized libraries which implements additional functionality
and may be unavailable on certain platforms/implementations.
Some possible libraries/packages:
 extended math/trig
 user information database access
 output control
 file system access (file existence, modification date...)
 extended node set manipulation (sort, uniq, symmetric difference...)
 localised string manipulation (upcase...)
 unicode character transformations ("uncompose", making characters from
 font property access (fit SVG rectangles around a string)
 image property access (format/encoding, width, hight, color depth...)
Namespaces woul prevent name clashes, as usual.
It would be interesting whether standardized *XSL* libraries would
not only include XPath extension functions but also built-in
variables (aka constants) and predefined templates. Stuff the processor
knows about could be more efficiently implemented/preoptimized.

For example:
<xsl:stylesheet xmlns:xsl="";
<xsl:template match="/">
<xsl:if test="not(xslposix:file-accessible('lock'))">
<xsl:call-template name="xslposix:mkdir">
<xsl:param name="name" select="concat('stuff',xsltrig:sin(0.1 * $PI)"/>

Oh well, i've probably gone much too far...


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======================================================================== Jim Melton --- Editor of ISO/IEC 9075-* (SQL) Phone: +1.801.942.0144 Oracle Corporation Oracle Email: mailto:jim.melton@xxxxxxxxxx 1930 Viscounti Drive Standards email: mailto:jim.melton@xxxxxxx Sandy, UT 84093-1063 Personal email: mailto:jim.melton@xxxxxxx USA Fax : +1.801.942.3345 ======================================================================== = Facts are facts. However, any opinions expressed are the opinions = = only of myself and may or may not reflect the opinions of anybody = = else with whom I may or may not have discussed the issues at hand. = ========================================================================

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