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Subject:
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infinite recursion
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Posted By:
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bangbangbogi
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Post Date:
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5/4/2006 5:19:38 AM
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i am trying to extract information from another xml doc. what i have done is to use the document method. The output that results is an infinite recursion. The following is my code
<?xml version="1.0"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="http://www.w3.org/TR/REC-html40">
<xsl:output method="html"/>
<xsl:variable name ="CSE4500xml" select="document('tutorialCSE4500.xml')"/>
<xsl:template match="/">
<xsl:apply-templates select = "units/unit"/>
</xsl:template>
<xsl:template match="unit">
<HTML>
<BODY>
<H2>UNIT TIMETABLE:<xsl:value-of select="name"/></H2>
Unit Code:
<xsl:value-of select="code"/>
<BR/>
Unit Lecturer:
<xsl:value-of select="unitLeader"/>
<table border="1">
<th align="left">Tutorial ID</th>
<th align="left">Tutor</th>
<th align="left">TimeTable</th>
<xsl:apply-templates select="$CSE4500xml/tutorialClasses/unit"/>
<TD><xsl:value-of select="tutorialClasses/unit/class"/></TD>
<TD><xsl:value-of select="tutorialClasses/unit/tutor"/></TD>
<TD><xsl:value-of select="tutorialClasses/unit/timetable"/></TD>
</table>
</BODY>
</HTML>
</xsl:template>
</xsl:stylesheet>
I know that the error occurs in the line that I just put in bold. But i do not know how to resolve it. Please help.
Thanks
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Reply By:
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joefawcett
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Reply Date:
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5/4/2006 5:28:07 AM
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You'll have to show some of the 'tutorialCSE4500.xml' for me to be sure but when you're inside the template that matches unit you make a call to $CSE4500xml/tutorialClasses/unit which then starts a recursion. As unit is the context node you can change the code to:
<table border="1"><tr>
<th align="left">Tutorial ID</th>
<th align="left">Tutor</th>
<th align="left">TimeTable</th></tr><tr>
<TD><xsl:value-of select="class"/></TD>
<TD><xsl:value-of select="tutor"/></TD>
<TD><xsl:value-of select="timetable"/></TD></tr>
</table>
That assumes you want a header for each unit which seems odd. You could move the header code a level up for example.
As I said if you this fails show an example of the source XML and your desired output.
On a side note why are you using the document function instead of just using the standard input method?
--
Joe (Microsoft MVP - XML)
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Reply By:
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bangbangbogi
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Reply Date:
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5/4/2006 5:50:14 AM
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Hi joe, thanks for the quick reply. the expected output that i want is
UNIT TIMETABLE:
Unit Code:
Unit Lecturer:
Tutorial ID Tutor TimeTable
the source file for the xml is
<?xml version="1.0"?>
<tutorialClasses xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="tutorial.xsd">
<unit>
<unitCode>CSE4500</unitCode>
<class ID="t1">
<tutor>Evi Syukur</tutor>
<timetable>
<day>Wednesday</day>
<time>2-4 PM</time>
</timetable>
<studentMark>
<student ID="s112233441">
<name>James Hird</name>
<assignments>
<assignment no="1">80</assignment>
<assignment no="2">90</assignment>
<unitTest>75</unitTest>
</assignments>
</student>
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Reply By:
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mhkay
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Reply Date:
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5/4/2006 5:54:11 AM
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Within this template rule
<xsl:template match="unit">
you are doing
<xsl:apply-templates select="$CSE4500xml/tutorialClasses/unit"/>
which is going to match the template rule you are in, causing a recursive call. There's nothing to terminate the recursion so it goes on for ever.
Change the template to say match="units/unit": this will stop the recursive call. But I don't know what processing you actually want to apply to tutorialClasses/unit - perhaps you need another template rule to define this. Or perhaps you don't want to apply-templates to tutorialClasses/unit at all, since you then go on to output its details using xsl:value-of.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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