Subject: RE: [xsl] side effects when debugging From: "Michael Kay" <mhk@xxxxxxxxx> Date: Tue, 12 Aug 2003 17:22:44 +0100 |
Norm Walsh introduced me to the delightful word "Heisenbug" to describe this phenomenon: http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?heisenbug Michael Kay > -----Original Message----- > From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx > [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Nick Laqua > Sent: 12 August 2003 16:35 > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > Subject: [xsl] side effects when debugging > > > > Hi everybody, > > > > I hope I don't mention a known problem though I checked the xsl faq > > and the list archives. > > > > I experienced strange behaviour depending on the debug > settings of the > > processor (see processor version below). > > > Vendor: Apache Software Foundation > Vendor URL: http://xml.apache.org/xalan-j > > > > > I am using the following stylesheet: > > > > <?xml version="1.0" encoding="ISO-8859-1"?> > > <xsl:stylesheet version="1.0" > > xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> > > > > > > <xsl:output method="xml" version="1.0" indent="yes"/> > > > > <xsl:template match="D"> > > <xsl:for-each select="A"> > > <xsl:sort select="POSITION" data-type="number" > order="ascending"/> > > <xsl:element name="PositionNr"> > > <xsl:value-of select="POSITION"/> > > </xsl:element> > > </xsl:for-each> > > </xsl:template> > > </xsl:stylesheet> > > > > > > > > The input file looks like this: > > > > <?xml version = "1.0" encoding = "ISO-8859-1"?> > > <D> > > <A> > > <POSITION>5</POSITION> > > <ACTION>1</ACTION> > > </A> > > <A> > > <POSITION>1</POSITION> > > <ACTION>1</ACTION> > > </A> > > <A> > > <POSITION>3</POSITION> > > <ACTION>1</ACTION> > > </A> > > </D> > > > > > > Without debugging options (command line inline), the result > looks like > > this (obviously correct): > > > > t:/Programme/JRE/1.4.1/bin/java.exe -cp > d:/cvsworking/nl/dev/classes/xalan.jar > > org.apache.xalan.xslt.Process -in > d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressourc > es/mapping/test/xml/test_sort.xml > > -xsl > > > d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressourc > es/mapping/test/xslt/test_sort.xslt > > <?xml version="1.0" encoding="UTF-8"?> > > <PositionNr>1</PositionNr> > > <PositionNr>3</PositionNr> > > <PositionNr>5</PositionNr> > > > > > > But enabling debugging (for instance trace selection events = -TS), > > the result is different (though using the same input): > > > > t:/Programme/JRE/1.4.1/bin/java.exe -cp > d:/cvsworking/nl/dev/classes/xalan.jar > > org.apache.xalan.xslt.Process -TS -in > d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressourc > es/mapping/test/xml/test_sort.xml > > -xsl > > > d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressourc > es/mapping/test/xslt/test_sort.xslt > > <?xml version="1.0" encoding="UTF-8"?> > > <PositionNr>1</PositionNr> > > <PositionNr>3</PositionNr> > > <PositionNr>5</PositionNr> > > <PositionNr>5</PositionNr> > > <PositionNr>1</PositionNr> > > <PositionNr>3</PositionNr> > > > > > > As you can see, in the second case, firstly all nodes are sorted > > correctly, but additional the same nodes are added in > document order. > > > > Is this a "design mistake" by me or a bug/something > specific to xalan > > ? In this case, I might post it to some xalan list. > > > > > > Thx a lot in advance > > > > Cheers Nick > > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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