Re: [xsl] Frustrated with xxx:node-set

[Dimitre Novatchev <dnovatchev@xxxxxxxxx>]

The result you report is produced when transforming with MSXML4.

 MSXML3 and .NET 1.1 XSLTTransform() class produce the correct result.

Interestingly, using the EXSLT for MSXML4 also produces the correct result.

Therefore, I'd recommend that you either switch from MSXML4 to MSXML3 or
.NET1.1

or
   install and use EXSLT for MSXML4 (this will be probably less painfull)

More details about EXSLT for MSXML4 can be found at:

     http://www.xml.com/pub/a/2003/08/06/exslt.html


Hope this helped.

Cheers,
Dimitre Novatchev.

On 6/2/05, Karl Stubsjoen <kstubs@xxxxxxxxx> wrote:
> All right, I did my best to create a "foobar" example.  Here it is...
> but first, let me explain the results produced:  You'll find 2 sets of
> <foobar_summary> elements; this corresponds to the number <A> elements
> in your source.  Within this element there is a <summary_for_foo> and
> <summary_for_bar> element.  In the 2nd set of <foobar_summary> the
> <summary_for_foo> is empty and this is the point of failure.
> See below:
> <summary_for_foo></summary_for_foo><!-- POINT OF FAILURE -->
> There is no reason that this set is emtpy, this is a quirk in the
> parser.  Notice that the next set <summary_for_bar> correctly
> summarizes the colors; it's as if the parser loses touch with reality
> and then rediscovers it.
> If you take away an A element so you just have one, the summary
> appears to work fine.  If you add multiple A elements you'll continue
> to see the "miss-behaviour"...
> Included, source xml; stylesheet; results (as produced parsing with
MSXML4):
>
> SOURCE XML:
> <?xml version="1.0"?>
> <FOOBAR>
> <A>
> <B code="FOO">red</B>
> <B code="BAR">green</B>
> <B code="FOO">blue</B>
> <B code="BAR">red</B>
> <B code="FOO">blue</B>
> <B code="BAR">green</B>
> <B code="BAR">green</B>
> <B code="FOO">green</B>
> <B code="BAR">blue</B>
> </A>
> <A>
> <B code="FOO">green</B>
> <B code="BAR">green</B>
> <B code="FOO">blue</B>
> <B code="BAR">green</B>
> <B code="FOO">red</B>
> <B code="BAR">green</B>
> <B code="FOO">green</B>
> <B code="FOO">green</B>
> <B code="BAR">blue</B>
> <B code="FOO">green</B>
> <B code="FOO">green</B>
> <B code="BAR">blue</B>
> </A>
> </FOOBAR>
>
> STYLESHEET ==============
> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> xmlns:fx="urn:schemas-microsoft-com:xslt">
>
> <xsl:key name="foobar" match="B" use="."/>
>
> <xsl:template match="/">
> <result>
> <xsl:apply-templates select="FOOBAR/A"/>
> </result>
> </xsl:template>
>
> <xsl:template match="A">
> <xsl:variable name="foo">
> <foo>
> <xsl:apply-templates select="B[@code='FOO']" mode="indentity_copy"/>
> </foo>
> </xsl:variable>
>
> <xsl:variable name="bar">
> <bar>
> <xsl:apply-templates select="B[@code='BAR']" mode="indentity_copy"/>
> </bar>
> </xsl:variable>
>
> <!-- what we are working on -->
> <xsl:copy-of select="fx:node-set($foo)"/>
> <xsl:copy-of select="fx:node-set($bar)"/>
>
> <!-- summary results foo -->
> <foobar_summary>
> <summary_for_foo>
> <xsl:apply-templates select="fx:node-set($foo)" mode="summary"/>
> </summary_for_foo>
>
> <!-- summary results bar -->
> <summary_for_bar>
> <xsl:apply-templates select="fx:node-set($bar)" mode="summary"/>
> </summary_for_bar>
> </foobar_summary>
> </xsl:template>
>
> <xsl:template match="B" mode="indentity_copy">
> <xsl:copy-of select="."/>
> </xsl:template>
>
> <!-- summary -->
> <xsl:template match="foo | bar" mode="summary">
> <xsl:apply-templates select="B[generate-id(.) =
> generate-id(key('foobar',.)[1])]" mode="summary"/>
> </xsl:template>
>
> <xsl:template match="B" mode="summary">
> <xsl:variable name="color" select="."/>
> <summary>
> <xsl:attribute name="code"><xsl:value-of select="@code"/></xsl:attribute>
> <xsl:attribute name="color"><xsl:value-of select="$color"/></xsl:attribute>
> <xsl:value-of select="count(../B[.=$color])"/>
> </summary>
> </xsl:template>
>
>
> </xsl:stylesheet>
>
> RESULT =================
> <?xml version="1.0" encoding="UTF-16" ?>
> <result xmlns:fx="urn:schemas-microsoft-com:xslt">
> <foo>
> <B code="FOO">red</B>
> <B code="FOO">blue</B>
> <B code="FOO">blue</B>
> <B code="FOO">green</B>
> </foo>
> <bar>
> <B code="BAR">green</B>
> <B code="BAR">red</B>
> <B code="BAR">green</B>
> <B code="BAR">green</B>
> <B code="BAR">blue</B>
> </bar>
> <foobar_summary>
> <summary_for_foo>
> <summary code="FOO" color="red">1</summary>
> <summary code="FOO" color="blue">2</summary>
> <summary code="FOO" color="green">1</summary>
> </summary_for_foo>
> <summary_for_bar>
> <summary code="BAR" color="green">3</summary>
> <summary code="BAR" color="red">1</summary>
> <summary code="BAR" color="blue">1</summary>
> </summary_for_bar>
> </foobar_summary>
> <foo>
> <B code="FOO">green</B>
> <B code="FOO">blue</B>
> <B code="FOO">red</B>
> <B code="FOO">green</B>
> <B code="FOO">green</B>
> <B code="FOO">green</B>
> <B code="FOO">green</B>
> </foo>
> <bar>
> <B code="BAR">green</B>
> <B code="BAR">green</B>
> <B code="BAR">green</B>
> <B code="BAR">blue</B>
> <B code="BAR">blue</B>
> </bar>
> <foobar_summary>
> <summary_for_foo></summary_for_foo><!-- POINT OF FAILURE -->
> <summary_for_bar>
> <summary code="BAR" color="green">3</summary>
> <summary code="BAR" color="blue">2</summary>
> </summary_for_bar>
> </foobar_summary>
> </result>
>
> On 6/1/05, Michael Kay <mike@xxxxxxxxxxxx> wrote:
> > >
> > > I want to strike up conversation/thread about the xxx:node-set, if
> > > anyone interested.  I am very frustrated with the lack of consistent
> > > performance I have witnessed using the xxx:node-set function with
> > > MSXML4 Parser.
> > >
> >
> > You haven't shown us any code or any performance measurements, so it's
> > difficult to make any comments. If you provided sample code and
measurement
> > data then people could see how other products compared, or tell you how
to
> > improve your code.
> >
> > There are at least two possible implementation strategies for result tree
> > fragments and xx:node-set() in XSLT 1.0: one is to build the RTF as a
> > regular tree, in which case xx:node-set() essentially costs nothing; the
> > other is to use some other internal structure for an RTF, in which case
> > xx:node-set() might be quite expensive. I've no idea which strategy MSXML
> > uses, but your measurements might help to shed some light, if they are
> > carefully made.
> >
> > Intrinsically, building trees with any product is likely to be an
expensive
> > operation. That's one reason that XSLT 2.0 sequences are so useful,
because
> > they involve less overhead.
> >
> > Michael Kay
> > http://www.saxonica.com/