Subject: Re: [xsl] question on random numbers for browser XSLT From: Ben Mendis <ben@xxxxxxxxxxxxxxxx> Date: Fri, 24 Jul 2009 09:58:08 -0400 |
Scott Trenda wrote: > Out of curiosity, wouldn't the Perl external-document approach be inaccurate due to the way XSLT function results are (supposed to be) evaluated and stored? That is, if you had this: > > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> > <xsl:output method="html" encoding="UTF-8" /> > > <xsl:template match="/"> > <html> > <body> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > <div>rand(6): <xsl:value-of select="document('/cgi-bin/rand.pl?6')" /></div> > </body> > </html> > </xsl:template> > > </xsl:stylesheet> > > Wouldn't that output the same result six times because (theoretically) the XSLT processor should only have to retrieve the contents of document('/cgi-bin/rand.pl?6') once, and just use the retrieved content for each successive call? It is the same URI, after all, but I'm not sure just how the gears of the big XSLT processors work in this situation. > > You could get around that limitation by adding a counter or some other unique identifier to the query string so that it looks like a different document is being requested. On the Perl side, it will just ignore any erroneous parameters. > ~ Scott > > -----Original Message----- > From: Hermann Stamm-Wilbrandt [mailto:STAMMW@xxxxxxxxxx] > Sent: Wednesday, July 22, 2009 7:43 AM > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > Subject: [xsl] question on random numbers for browser XSLT > > > I want random numbers in a stylesheet but I am bound to XSLT 1.0 and > not able to make use of "http://exslt.org/random" extensions because > the stylesheet should be accessed by <?xml-stylesheet ...?> in a > browser XML document. > > Is there a pure XSLT solution? > (the quality of the generated random numbers is not that important) > > > After some playing around I found below (not pure XSLT) solution. > Important is that the PERL script lives in the same domain as the > stylesheet. You may try it out (random number "0-5") by clicking here: > http://stamm-wilbrandt.de/en/xsl-list/random/rand6.xml > > > $ cat rand6.xml > <?xml version="1.0" encoding="ISO-8859-1"?> > <?xml-stylesheet type="text/xsl" href="rand6.xsl"?> > <tag/> > > $ cat rand6.xsl > <xsl:stylesheet > version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> > <xsl:output method="html" encoding="UTF-8"/> > > <xsl:template match="/"> > <xsl:variable name="rand" > select="document('/cgi-bin/rand.pl?6')"/> > <html><body>rand(6): <xsl:value-of select="$rand"/></body></html>: > </xsl:template> > > </xsl:stylesheet> > $ > > $ cat cgi-bin/rand.pl > #!/usr/bin/perl -w. > > print "Content-type: text/xml\n\n"; > > printf("<?xml version=\"1.0\"?>\n"); > printf("<rand>%d</rand>\n", rand($ARGV[0])); > printf("<!-- PERL rand(%d) -->\n",$ARGV[0]); > > > Mit besten GrC<Cen / Best wishes, > > Hermann Stamm-Wilbrandt > Developer, XML Compiler > WebSphere DataPower SOA Appliances > ---------------------------------------------------------------------- > IBM Deutschland Research & Development GmbH > Vorsitzender des Aufsichtsrats: Martin Jetter > GeschC$ftsfC<hrung: Erich Baier > Sitz der Gesellschaft: BC6blingen > Registergericht: Amtsgericht Stuttgart, HRB 243294 > > > > -- Ben Mendis Support Specialist Antenna House 10410 Kensington Pkwy Suite 207 Kensington, Maryland 20895 USA Phone: +1 301-942-4007 Email: ben@xxxxxxxxxxxxxxxx Web: www.antennahouse.com
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