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Re: [xsl] position matching

2008-11-28 01:06:18
Thank you very much Vasu and Michael for you valuable suggesting and
pointing out my mistakes.

the provided style sheet is working with small modification.

<mac:value-of  select="{/map/source[$position]}"/>
changed to
<mac:value-of select="{../source[$pos]}"/>

Regards,
Ganesh


On Thu, Nov 27, 2008 at 4:14 PM, Vasu Chakkera <vasucv(_at_)gmail(_dot_)com> 
wrote:
Ok here goes your errors in stylesheets..

 <xsl:for-each select="target[$pos > 1]">
                                               <mac:attribute 
name="substring-after({target[$pos]},'@')">
                                                       <mac:value-of  
select="(preceding-sibling::source)[$pos]"/>
                                                       </mac:attribute>
                                               </xsl:for-each>

Problem 1 :
You are selecting the target > 1 so in the resulting nodeset, you will
have 2nd target and the 3rd target ( in the order of your xml) //

So you have lost the positioning of the input XML source , so you will
never get the correct source value with your position, because the
position() will give 1 for the 2nd target ( of your xml) and 2 for the
third target (of your XML)..

So for getting your numbering correct you muct allow all the targets
in and possibly put an if condition to not process the first one.

 <xsl:for-each select="target">

Problem 2:
  <mac:attribute name="substring-after({target[$pos]},'@')">

Firstly, you have used the  Attribute Value Template wrongly ..
so the above should be
 <mac:attribute name="{substring-after(target[$pos],'@')}">
 Secondly :
Your for-each loops through target. So your current context is the
target element.
and your substring-after is looking for target element under the
crrent context. so unless there was  target/target, you will never
win.

It should have been :

  <mac:attribute name="{substring-after(.,'@')}">

Problem 3:
 <mac:value-of  select="(preceding-sibling::source)[$pos]"/>

As mentioned in the problem 1: , Your use of position is wrong..
because of your filter in the for-each that counts from the second
target element. You will never get the correct corresponding source
element.

what you want is  better imagined, if you could use /map/source , to
match the corresponding source ( coming from top to down)

so define:

<xsl:variable name = "position" select="position()"/>

and then use

<mac:value-of  select="{/map/source[$position]}"/>



So here is the complete Stylesheet:

<xsl:template match="map">
               <xsl:if test="count(child::source) = count(child::target) and
               not( count(child::*) = 2 )">
                       <mac:template match="{source[1]}">
                               <mac:element name="{target[1]}">
                                       <xsl:for-each select="target">
                                               <xsl:variable name = 
"position" select="position()"/>
                                               <xsl:if test = "not(position() 
= 1)">
                                                       <mac:attribute  
name="{substring-after(.,'@')}">
                                                               <mac:value-of  
select="{/map/source[$position]}"/>
                                                       </mac:attribute>
                                               </xsl:if>
                                       </xsl:for-each>
                                       <mac:apply-templates 
select="@*|node()"/>
                               </mac:element>
                       </mac:template>
               </xsl:if>
       </xsl:template>

The above produces:
<mac:template match="article">
       <mac:element name="article">
               <mac:attribute name="article-type">
                       <mac:value-of select="@docsubtype" />
               </mac:attribute>
               <mac:attribute name="dtd-version">
                       <mac:value-of select="@version" />
               </mac:attribute>
               <mac:apply-templates select="@*|node()" />
       </mac:element>
</mac:template>

HTH

Vasu Chakkera.

2008/11/27 Ganesh Babu N <nbabuganesh(_at_)gmail(_dot_)com>:
Hai

Based on Michael points i have updated the XSL but I am not getting
any output. Please help me.
<xsl:template match="map">
<xsl:if test="count(child::source) = count(child::target) and
count(child::*) != 2">
                               <xsl:variable name="pos"><xsl:value-of
select="target[position()]"/></xsl:variable>
                               <mac:template match="{source[$pos]}">
                                       <mac:element name="{target[$pos]}">
                                               <xsl:for-each 
select="target[$pos > 1]">
                                               <mac:attribute 
name="substring-after({target[$pos]},'@')">
                                                       <mac:value-of
select="(preceding-sibling::source)[$pos]"/>
                                                       </mac:attribute>
                                               </xsl:for-each>
                                       <mac:apply-templates 
select="@*|node()"/>
                                       </mac:element>
                               </mac:template>
                       </xsl:if>
</xsl:template>

Regards,
Ganesh


On Wed, Nov 26, 2008 at 4:31 PM, Michael Kay <mike(_at_)saxonica(_dot_)com> 
wrote:
Two obvious errors, excluding typos:

(1) target[position() > 2] should be target[position() > 1]

(2) preceding-sibling::source[position()] - you've forgotten that the
context inside a predicate changes. You need to bind position() to a
variable p outside the expression and then use
preceding-sibling::source[$p]. Or in fact I suspect it should be
(preceding-sibling::source)[$p] because you want them numbered in forwards
rather than reverse order.

Michael Kay
http://www.saxonica.com/



-----Original Message-----
From: Ganesh Babu N [mailto:nbabuganesh(_at_)gmail(_dot_)com]
Sent: 26 November 2008 10:52
To: XSL
Subject: [xsl] position matching

Hai All,

I am working on automatic XSLT generation project and here is
the mapping table.

Here is my XML file:
 <map>
      <source>article</source>
      <source>@docsubtype</source>
      <source>@version</source>
      <target>article</target>
      <target>@article-type</target>
      <target>@dtd-version</target>
   </map>

My stylesheet:

<xsl:template match="map">
<xsl:if test="count(child::source) = count(child::target) and
count(child::*) != 2">
<mac:template match="{source[1]}">
<mac:element name="{target[1]}">
<xsl:for-each select="target[position() > 2"> <mac:attribute
name="substring-after({target},'@')"><mac:value-of
select="preceding-sibling::source[position()]"/></mac:attribute>
<xsl:for-each>
<mac:apply-templates select="@*|node()"/> </mac:element>
</mac:template> </xsl:if> </xsl:template>

Expected Output:

<xsl:template match="article>
<xsl:element name="article">
<xsl:attribute name="article-type"><xsl:value-of
select="@docsubtype"></xsl:attribute>
<xsl:attribute name="@dtd-version"><xsl:value-of
select="@version"></xsl:attribute>
</xsl:element>
<xsl:template>


I am not getting the desired result. Please let me know where
I am going wrong.

Regards,
Ganesh

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--
Vasu Chakkera
Numerical Algorithms Group Ltd.
Oxford
www.vasucv.com

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