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Re: position matching

Subject: Re: position matching
From: "Vasu Chakkera" <vasucv@xxxxxxxxx>
Date: Thu, 27 Nov 2008 10:44:35 +0000
Re:  position matching
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@xxxxxxxxx>:
> 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)[$pos]"/>
>                                                        </mac:attribute>
>                                                </xsl:for-each>
>                                        <mac:apply-templates select="@*|node()"/>
>                                        </mac:element>
>                                </mac:template>
>                        </xsl:if>
> </xsl:template>
>
> Regards,
> Ganesh
>
>
> On Wed, Nov 26, 2008 at 4:31 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>> Two obvious errors, excluding typos:
>>
>> (1) target[position() > 2] should be target[position() > 1]
>>
>> (2) preceding-sibling::source[position()] - you've forgotten that the
>> context inside a predicate changes. You need to bind position() to a
>> variable p outside the expression and then use
>> preceding-sibling::source[$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@xxxxxxxxx]
>>> Sent: 26 November 2008 10:52
>>> To: XSL
>>> Subject:  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
>
>



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

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