RE: Using key and position()

Firstly, $p is a node-set, whereas you appear to be using it in a predicate
as if it were a number. When $p is a node-set, $seq[$p] will give you all
the nodes in $seq if $p is non-empty, or none of the nodes in $seq if it is
empty. You almost certainly meant to write $seq[number($p)].

However, if $var_27[$p] is displaying nothing, then there must be yet
another bug in your code, because it means that either $p is empty (in which
case number($p) isn't going to be useful) or $var_27 is empty (in which case
selecting it's $p'th item isn't going to do any good).

I've found it: you're calling key() with generate-id() as the second
argument, but the nodes are indexed on the value of @id. There's no reason
why the generate-id() of a node should match the @id attribute - you seem to
be confused about its purpose.

As I suggested before, I think you would be better off explaining the
problem you are trying to solve, because I strongly suspect the way you are
going about it might be completely wrong.

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

> -----Original Message-----
> From: Bhupendra Singh [mailto:skbhupendra@xxxxxxxxxxx] 
> Sent: 16 November 2004 21:08
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: RE:  Using key and position()
> 
> Michael,
> My problem is something else.
> 
> I am not able to access the variable. So I am getting
> an undefined value for $p
> 
> <xsl:variable name="p" select="key('parentGroups',
> generate-id())/@pos" />
> 
> I think the problem is with the key/variable
> definition, which is giving nothing for $p.
> 
> Your suggestion below will be useful only if I get
> some value of $p.
> But currently the <xsl:value-of select="$p"/> is
> printing a blank.
> 
> 
> <PRI_HEADER><xsl:value-of select="$p"/>
>    <xsl:value-of select="$var_27[$p]"/>
> </PBU_HEADER>
> 
> 
>  --- Michael Kay <mike@xxxxxxxxxxxx> wrote: 
> > position() returns the position of a node in the
> > list of nodes that you are
> > currently iterating over. So
> > 
> > <xsl:variable name="parentGroup">
> >   <xsl:for-each select="ParentGroup">
> >     <parentgroup id="generate-id()"
> > pos="position()"/>
> >   </xsl:for-each>
> > </xsl:variable>
> > 
> > will give you values 1,2,3 etc.
> > 
> > You will get what you are looking for by:
> > 
> > <xsl:variable name="parentGroup">
> >   <xsl:for-each select="*">
> >     <xsl:if test="self::parentGroup">
> >        <parentgroup id="generate-id()"
> > pos="position()"/>
> >     </xsl:if>
> >   </xsl:for-each>
> > </xsl:variable>
> > 
> > However, there might be a much easier way of doing
> > what you are trying to
> > do, if you explained your overall problem rather
> > than your approach to
> > solving it.
> > 
> > Michael Kay
> > http://www.saxonica.com/
> > 
> > > -----Original Message-----
> > > From: Bhupendra Singh
> > [mailto:skbhupendra@xxxxxxxxxxx] 
> > > Sent: 16 November 2004 16:13
> > > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > > Subject:  Using key and position()
> > > 
> > > Hi,
> > > I have an input XML like this:
> > > 
> > > <action>
> > > 	- <ParentGroup> Node1 </ParentGroup>
> > > 	- <ChildGroup> Node1.1 </ChildGroup>
> > > 	- <Child Node1>1.1.1 </Child Node1>
> > > 	- <Child Node2>1.1.2 </Child Node2>
> > > 	- <ParentGroup> Node1 </ParentGroup>
> > > 	- <ChildGroup> Node1.2 </ChildGroup>
> > > 	- <Child Node1>1.2.1 </Child Node1>
> > > 	- <Child Node2>1.2.2 </Child Node2>
> > > 	- <ParentGroup> Node1 </ParentGroup>
> > > 	- <ChildGroup> Node1.3 </ChildGroup>
> > > 	- <Child Node1>1.3.1 </Child Node1>
> > > 	- <Child Node2>1.3.2 </Child Node2>
> > > 	- <ParentGroup> Node1 </ParentGroup>
> > > 	- <ChildGroup> Node1.3 </ChildGroup>
> > > 	- <Child Node1>1.3.x </Child Node1>
> > > 	- <Child Node2>1.3.y </Child Node2>
> > > 
> > > 	- <ParentGroup> Node2 </ParentGroup>
> > > 	- <ChildGroup> Node2.1 </ChildGroup>
> > > 	- <Child Node1>2.1.1 </Child Node1>
> > > 	- <Child Node2>2.1.2 </Child Node2>
> > > 	- <ParentGroup> Node2 </ParentGroup>
> > > 	- <ChildGroup> Node2.2 </ChildGroup>
> > > 	- <Child Node1>2.2.1 </Child Node1>
> > > 	- <Child Node2>2.2.2 </Child Node2>
> > > 	- <ParentGroup> Node2 </ParentGroup>
> > > 	- <ChildGroup> Node2.3 </ChildGroup>
> > > 	- <Child Node1>2.3.1 </Child Node1>
> > > 	- <Child Node2>2.3.2 </Child Node2>
> > > ...........
> > > </action>
> > > 
> > > I want to capture the position of each of the
> > > <ParentGroup> elements and store it in a variable
> > by
> > > going through the document only once. 
> > > 
> > > <xsl:variable name="parentGroup">
> > >   <xsl:for-each select="ParentGroup">
> > >     <parentgroup id="generate-id()"
> > pos="position()"/>
> > >   </xsl:for-each>
> > > </xsl:variable>
> > > 
> > > 
> > > Then I want to use this variable to get the
> > position
> > > of each <ParentGroup> and find its coresponding
> > > <ChildGroup> and <Child Nodes>.
> > > 
> > > When I print the contents of the variable(@id and
> > > @pos), then I find that the content is correct,
> > but
> > > when I try to retreive the content using key then
> > I
> > > get nothing.  Here is the XSL that I have.
> > > 
> > > 
> > > <?xml version="1.0" ?>
> > > <xsl:stylesheet
> > > xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> > > version="1.0">
> > > 
> > > <!-- Key to group distinct ChildGroup's -->
> > > <xsl:key name="SEC_CUST" match="ChildGroup"
> > use="."/>
> > > 
> > > <!-- Key to group distinct ParentGroup's -->
> > > <xsl:key name="PRI_CUST" match="ParentGroup"
> > use="."/>
> > > 
> > > <!-- Key to find position of ParentGroup's -->
> > > <xsl:key name="parentGroups" match="parentGroup"
> > > use="@id"/>
> > > 
> > > <xsl:template match="/">
> > > 	<xsl:apply-templates/>
> > > </xsl:template>
> > > 
> > > 
> > > <xsl:template match="action">
> > > <TRANS_OUTPUT>
> > > <CUSTOMERS>
> > > <xsl:variable name="var_24" select="Child Node1"
> > />
> > > <xsl:variable name="var_27" select="Child Node2"
> > />
> > > 
> > > <!-- Variable to store the posittion of each
> > > ParentGroup nodes -->
> > > <xsl:variable name="parentGroup"> 
> > >   <xsl:for-each select="ParentGroup">
> > >     <parentgroup>
> > >     <xsl:attribute name="id"
> > select="generate-id()"/>
> > >     <xsl:attribute name="pos"
> > select="position()"/>
> > >     </parentgroup>
> > >   </xsl:for-each>
> > > </xsl:variable>
> > > 
> > >   <xsl:for-each select="$var_21[count(. |
> > > key('PRI_CUST', .)[1]) = 1]">
> > >   <PRIMARY CUSTOMER>
> > >      <xsl:variable name="priId" select="." />
> > >      <xsl:variable name="p"
> > > select="key('parentGroups', generate-id())/@pos"
> > />
> > >      <PRI_HEADER><xsl:value-of select="$p"/>
> > >           <xsl:value-of select="$var_27[$p]"/>
> > >      </PBU_HEADER>
> > >      <PRIMARY_CUST_DESC>
> > >         <xsl:value-of select="$var_24[$p]"/>
> > >         <xsl:text> </xsl:text>
> > >         <xsl:value-of select="$priId"/>
> > >      </PRIMARY_CUST_DESC>
> > > 
> > >      <SECONDARY CUSTOMER> 
> > >       <xsl:for-each select= SECONDARY CUSTOMER....
> > >       ....group &.Do processing for Sec customers
> > >      </SECONDARY CUSTOMER> 
> > > 
> > >     </End of for loop for Primary cusotmer>
> > >     </PRIMARY CUSTOMER>
> > > </CUSTOMERS>
> > > </TRANS_OUTPUT>
> > > 
> > > 
> > > In the above XSL..I get the value of $p undefined 
> > > 
> > > <xsl:variable name="p" select="key('parentGroups',
> > > generate-id())/@pos" />
> > > 
> > > So when I access $var_27[$p] and $var_24[$p] ..I
> > get
> > > nothing.
> > > 
> > >      <PRI_HEADER><xsl:value-of select="$p"/>
> > >           <xsl:value-of select="$var_27[$p]"/>
> > >      </PBU_HEADER>
> > >      <PRIMARY_CUST_DESC>
> > >         <xsl:value-of select="$var_24[$p]"/>
> > >         <xsl:text> </xsl:text>
> > >         <xsl:value-of select="$priId"/>
> > >      </PRIMARY_CUST_DESC>
> > > 
> > > 
> > > Can someone please let me know what has gone
> > wrong.
> > > 
> > > 
> > > 
> > > 
> > > 		
> > >
> >
> ___________________________________________________________
> > 
> > 
> === message truncated === 
> 
> =====
> regards,
> Bhupendra.
> 
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