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Suspected XSLT issue; Failing "choose"
Added by Anonymous about 19 years ago
Legacy ID: #3314085
Legacy Poster: Lars J. Nilsson (larsan)
Hello, Following this text I will include two test documents
"test.xml" and "test.xsl" which are snipplets from
my live code demonstrating a failing "choose" contruct in a
stylesheet. This particular bit of code have failed in both Saxon 6.5.4 and Saxon-B
8.5.1. The files in this post have been tested on Saxon-B 8.5.1 using a vanilla Java JDK
install... >>> java version "1.4.2_08" Java(TM) 2
Runtime Environment, Standard Edition (build 1.4.2_08-b03) Java HotSpot(TM) Client VM
(build 1.4.2_08-b03, mixed mode) >>> .. and the following command
line: >>> java -classpath saxonb-8.5.1.jar net.sf.saxon.Transform
-v -o test.html test.xml test.xsl 2> err.txt >>> The problem
is the "para"-matching template at line 15 when called from a nested
context (line 51). It does a truly trivial match (on "true()") and
encloses anything in HTML divs according to the test. Looking at the source document the
first "para" (at line 5) is transformed correctly. However, the
following "para" elements enclosed within
"description" elements are not correctly transformed, they get
enclosing "div" in the output. The template explicitly handles the
"form" element decendants down to the "description"
element and then calls "apply-templates" (at line 51 in the
stylesheet). Removing the "choose"-contruct in the
"para"-template and eclosing everything in the same
"div" element does work. Regards - Lars J. Nillsson test.xml
>>> <template xml:space="default">
<page> <content> <section
title="Signup"> <para>A simple confimration
para.</para> <form action="./"
method="post" name="signupform">
<field name="is-submission" type="hidden"
value="true" label="is-submission"/>
<field name="username" id="username"
type="text" label="Username"/> <field
name="password" id="password"
type="password" label="Password">
<description> <para>Small first para.</para>
</description> </field> <field
name="password_c" id="password_c"
type="password" label="Confirm password"/>
<field name="email" id="email"
type="text" label="Email">
<description> <para>Small second para.</para>
</description> </field> <field
name="captcha" id="captcha"
type="text" label="Confirm">
<description> <para>This is the captcha
text.</para> </description> </field>
</form> </section> </content>
</page> </template> >>> test.xml
test.xsl >>> <?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" doctype-public="-//W3C//DTD
HTML 4.01 Transitional//EN"
doctype-system="http://www.w3.org/TR/html4/loose.dtd" />
<!-- - Error: This template does not work when called from line 51 as a child -
element of "description" --> <xsl:template
match="para" > <xsl:choose> <xsl:when
test="true()"> <div
class="correct-para"><xsl:apply-templates
/></div> </xsl:when> <xsl:otherwise>
<div class="incorrect-para"><xsl:apply-templates
/></div> </xsl:otherwise> </xsl:choose>
</xsl:template> <xsl:template match="form"
> <form action="{@action}"
method="{@method}"> <xsl:if
test="@style"> <xsl:attribute
name="style"><xsl:value-of
select="@style" /></xsl:attribute>
</xsl:if> <xsl:if test="@class">
<xsl:attribute name="class"><xsl:value-of
select="@class" /></xsl:attribute>
</xsl:if> <xsl:for-each select="field[@type =
'hidden']"> <input type="hidden"
value="{@value}" name="{@name}" />
</xsl:for-each> <table cellpadding="0"
cellspacing="0" border="0"
class="formtable"> <tbody>
<xsl:apply-templates /> </tbody> </table>
</form> </xsl:template> <xsl:template
match="field[@type != 'hidden']"> <xsl:if
test="description"> <tr> <td
class="formcell"></td> <td
class="formcell"> <xsl:for-each
select="description/"> <xsl:apply-templates />
</xsl:for-each> </td> </tr>
</xsl:if> <tr> <td class="formcell"
valign="top"> <xsl:if test="@label and @type !=
'submit' and @type != 'checkbox'"> <div
class="formlabel"> <xsl:value-of
select="@label" /><xsl:text>:
</xsl:text> </div> </xsl:if>
</td> <td class="formcell"
width="75%"> <xsl:call-template
name="put-field" /> <xsl:if test="@type =
'checkbox'"> <span
class="checkboxlabel"> <xsl:value-of
select="@label" /> </span>
</xsl:if> </td> </tr> <xsl:if
test="error"> <tr> <td
class="formcell"></td> <td
class="formcell"> <div
class="formerror"> <xsl:text>
</xsl:text><xsl:value-of select="error/text()"
/> </div> </td> </tr>
</xsl:if> </xsl:template> <xsl:template
name="put-field" > <xsl:choose> <xsl:when
test="@type = 'option'"> <select
name="{@name}"> <xsl:if
test="@style"> <xsl:attribute
name="style"><xsl:value-of
select="@style" /></xsl:attribute>
</xsl:if> <xsl:if test="@class">
<xsl:attribute name="class"><xsl:value-of
select="@class" /></xsl:attribute>
</xsl:if> <xsl:if test="@id">
<xsl:attribute name="id"><xsl:value-of
select="@id" /></xsl:attribute>
</xsl:if> <option value="">Please select:
</option> <xsl:for-each select="option">
<xsl:element name="option"> <xsl:attribute
name="value"><xsl:value-of
select="@value" /></xsl:attribute> <xsl:if
test="@selected = 'true'"> <xsl:attribute
name="selected"><xsl:value-of
select="'selected'" /></xsl:attribute>
</xsl:if> <xsl:value-of select="@name" />
</xsl:element> </xsl:for-each> </select>
</xsl:when> <xsl:when test="@type =
'textarea'"> <textarea name="{@name}"
cols="50" rows="20"> <xsl:if
test="@style"> <xsl:attribute
name="style"><xsl:value-of
select="@style" /></xsl:attribute>
</xsl:if> <xsl:if test="@class">
<xsl:attribute name="class"><xsl:value-of
select="@class" /></xsl:attribute>
</xsl:if> <xsl:if test="@id">
<xsl:attribute name="id"><xsl:value-of
select="@id" /></xsl:attribute>
</xsl:if> <xsl:value-of select="@value" />
</textarea> </xsl:when> <xsl:when
test="@type != 'submit'"> <input
type="{@type}" value="{@value}"
name="{@name}"> <xsl:if test="@type =
'checkbox' and @value = 'true'"> <xsl:attribute
name="checked"><xsl:value-of
select="'checked'" /></xsl:attribute>
</xsl:if> <xsl:if test="@style">
<xsl:attribute name="style"><xsl:value-of
select="@style" /></xsl:attribute>
</xsl:if> <xsl:if test="@class">
<xsl:attribute name="class"><xsl:value-of
select="@class" /></xsl:attribute>
</xsl:if> <xsl:if test="@image">
<xsl:attribute name="src"><xsl:value-of
select="@image" /></xsl:attribute>
</xsl:if> <xsl:if test="@id">
<xsl:attribute name="id"><xsl:value-of
select="@id" /></xsl:attribute>
</xsl:if> </input> </xsl:when>
<xsl:otherwise> <button type="submit"
value="{@value}"> <xsl:if
test="@style"> <xsl:attribute
name="style"><xsl:value-of
select="@style" /></xsl:attribute>
</xsl:if> <xsl:if test="@class">
<xsl:attribute name="class"><xsl:value-of
select="@class" /></xsl:attribute>
</xsl:if> <xsl:if test="@image">
<xsl:attribute name="src"><xsl:value-of
select="@image" /></xsl:attribute>
</xsl:if> <xsl:if test="@id">
<xsl:attribute name="id"><xsl:value-of
select="@id" /></xsl:attribute>
</xsl:if> <xsl:value-of select="@label" />
</button> </xsl:otherwise> </xsl:choose>
</xsl:template> </xsl:stylesheet> >>>
test.xsl
Legacy ID: #3314184
Legacy Poster: Michael Kay (mhkay)
Remember that <xsl:apply-templates/> with no select attribute means
<xsl:apply-templates select="child::node()"/>. So when
you write: <xsl:for-each select="description/">
<xsl:apply-templates /> </xsl:for-each> you are processing
the child elements of description (the para element) and then applying templates to the
children of the para element (the text node): the built-in template rule for text nodes
simply copies the text to the result tree. I suspect the above code should simply be
replaced by <xsl:apply-templates
select="description/"/> I can't see how you came to the
conclusion that the xsl:choose is relevant. Replacing the "para"
template by <xsl:template match="para" > <div
class="correct-para"><xsl:apply-templates
/></div> </xsl:template> produces exactly the same
output, as you would expect. Michael Kay http://www.saxonica.com/ P.S. Try the -T option
on the command line to trace the execution of template rules, it can greatly help with
debugging this kind of problem.
Legacy ID: #3314769
Legacy Poster: Lars J. Nilsson (larsan)
Ooouch! There's me spraying my morning coffe all over the keyboard again. I can't
believe I just screwed up that badly. [insert long rant with a lot of swedish swearwords
here] Of course it does. You have my heartfelt appologies for bothering you. And my
thanks for pointing out the fairly obvious error, I would most likely have spent quite a
few hours just staring at it otherwise. And while I'm at it, thanks for a good product.
I switched to saxon when xalan and/or the resin libs repeatedly failed to produce what I
thought was fairly trivial. And I'll check out the -T flag, all of my XML and some of my
XSL is dynamically produced in SAX-based pipelines so I normally don't use the command
line at all. Obviously, after this... emberrasment, I probably will. Yes... I think I
shall.
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