RE: [xsl] Trouble removing dup elements based on attributes

["Chris Loschen" <Chris.Loschen@xxxxxxxxxx>]

I'm not sure why your choice 1 isn't working (perhaps you need a
reference to context node?), but your two options are not logically
equivalent. Take the case when A is true and B is false. In that case,
"not(A and B)" returns true because A and B are not both true, but
"not(A) and not(B)" returns false because A is true.

Choice 1 looks like the way to achieve what you want logically. I'll let
someone else figure out why it isn't working for you.

Chris Loschen

-----Original Message-----
From: Al Bean [mailto:albean88@xxxxxxxxxxx]
Sent: Saturday, June 25, 2005 11:25 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] Trouble removing dup elements based on attributes

Thanks, Sam.

I now have a better understanding of the difference between preceding
and preceding-sibling.  And I see how that works whereas my attempt did
not.
Also, one of my big mistakes was using
attrib[@name='Names']/rs/row/@firstname  rather than just row/@firstname
as you pointed out.  Thanks.

I've extended my problem now to include more than one attribute and I've
run into trouble, again.  I'm not sure if it is because I don't
understand the specifics of logical operators in XPath or the specifics
of preceding-sibling.  (probably both :-) though)

Now I would like to test against firstname AND lastname.
(so I would like to have the second product node in my out to be:
Sam
Ron
Sam
Because each Sam has a different last name.)

These test fail:
<xsl:if test=" not(@firstname=preceding-sibling::row/@firstname) and
not(@ln=preceding-sibling::row/@ln) ">

<xsl:if test=" not(@firstname=preceding-sibling::row/@firstname and
@ln=preceding-sibling::row/@ln) ">

I don't see why these should fail.  It makes sense that if one of these
fails the other should since they are logically equivalent. But I do see
why this logic fails, basically what I (think I) am saying is if the
current row matches a previous siblings lastname AND first name then
reject it.  How do I check against two (or more) attributes?

-------------------------------------
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0" xmlns:ns="http://w.ns.c/ns/prod/";>
     <xsl:template match="/">
         <Products>
             <xsl:apply-templates/>
         </Products>
     </xsl:template>

     <xsl:template match="product">
         <Product>
             <Names>
                 <xsl:apply-templates mode="XXX"
select="attrib[@name='Names']/rs/row"/>
             </Names>
        </Product>
     </xsl:template>

<xsl:template mode="XXX" match="attrib[@name='Names']/rs/row">
<xsl:if test=" not(@firstname=preceding-sibling::row/@firstname) and
not(@ln=preceding-sibling::row/@ln) ">
         <name>
             <xsl:value-of select="@firstname"/>
        </name>
     </xsl:if>
   </xsl:template>
</xsl:transform>

-------------------------------------
<prods>
	<product>
		<attrib name="P">product 1</attrib>
		<attrib name="Names">
			<rs>
				<row ln="xxx" firstname="Bill"/>
				<row ln="xxx" firstname="Bill"/>
			</rs>
		</attrib>
	</product>
	<product>
		<attrib name="P">product 2</attrib>
		<attrib name="Names">
			<rs>
				<row ln="qqq" firstname="Sam"/>
				<row ln="xxx" firstname="Ron"/>
				<row ln="xxx" firstname="Sam"/>
				<row ln="xxx" firstname="Ron"/>
			</rs>
		</attrib>
	</product>
	<product>
		<attrib name="P">product 3</attrib>
		<attrib name="Names">
			<rs>
				<row ln="xxx" firstname="Ron"/>
				<row ln="xxx" firstname="Sam"/>
				<row ln="xxx" firstname="Joe"/>
				<row ln="xxx" firstname="Sam"/>

			</rs>
		</attrib>
	</product>
</prods>


>From: "Sam D. Chuparkoff" <sdc@xxxxxxxxxx>
>Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>Subject: Re: [xsl] Trouble removing dup elements based on attributes
>Date: Fri, 24 Jun 2005 18:40:18 -0700
>
>Hey, 'Sam', that's me.
>
>On Fri, 2005-06-24 at 23:14 +0000, Al Bean wrote:
> > Hi,
> >
> > I just started using XSLT today and I'm trying to figure out how to
> > get
>rid
> > of some duplicated elements.  I know that I need to do something to
> > the "XXX" template but I am not sure what to do.
> >
> > I've tried this for the XXX template but it does not work:
> > <xsl:template mode="XXX" match="attrib[@name='Names']/rs/row">
> >     <xsl:if test="not(@firstname =
> > preceding::attrib[@name='Names']/rs/row/@firstname)">
> >         <xsl:element name="ns:name">
> >             <xsl:value-of select="@firstname"/>
> >         </xsl:element>
> >     </xsl:if>
> >   </xsl:template>
>
>You should include output using this template and explain why it
>confuses you.
>
> >From the xpath spec (1.0):
>
>   the preceding axis contains all nodes in the same document as the
>   context node that are before the context node in document order,
>   excluding any ancestors and excluding attribute nodes and namespace
>   nodes
>
>So preceding::attrib[@name='Names'] won't match the ancestor attrib of
>the current row. It will match all previous attrib[@name='Names'] in
>the document. But this means matching attrib s from other products,
>which clearly isn't what you want.
>
>If all the rows you need to consider are really siblings (as in your
>input), your test should be:
>
>not(@firstname=preceding-sibling::row/@firstname)
>
>Also, I don't know why you're using xsl:element most (but not all) of
>the time. Don't use xsl:element unless you have to (which means: unless

>you don't know the name of the element).
>
>And you might like to look into trying:
>
>  <xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
>   version="1.0" xmlns="http://w.ns.c/ns/prod/";>
>
>And then just writing:
>
><Products/>
>
>Just didn't want you to assume namespaces have to be so clunky.
>
>There are some faqs about removing duplicates here:
>
>http://www.dpawson.co.uk/xsl/sect2/N2696.html
>
>sdc
>
> >
> > Thanks in advance for any help.
> >
> >
> >
> >
> > ----------------------
> > My XSL
> > ----------------------
> >
> > <xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> > version="1.0" xmlns:ns="http://w.ns.c/ns/prod/";>
> >     <xsl:template match="/">
> >         <ns:Products>
> >             <xsl:apply-templates/>
> >         </ns:Products>
> >     </xsl:template>
> >
> >     <xsl:template match="product">
> >         <xsl:element name="ns:Product">
> >             <xsl:element name="ns:Names">
> >                 <xsl:apply-templates mode="XXX"
> > select="attrib[@name='Names']/rs/row"/>
> >             </xsl:element>
> >         </xsl:element>
> >     </xsl:template>
> >
> >     <xsl:template mode="XXX" match="attrib[@name='Names']/rs/row">
> >         <xsl:element name="ns:name">
> >             <xsl:value-of select="@firstname"/>
> >         </xsl:element>
> >     </xsl:template>
> > </xsl:transform>
> >
> >
> > ----------------------------------------------------
> > Input XML :
> > ----------------------------------------------------
> >
> > <prods>
> >     <product>
> >         <attrib name="P">product 1</attrib>
> >         <attrib name="Names">
> >             <rs>
> >                 <row firstname="Bill"/>
> >                 <row firstname="Bill"/>
> >             </rs>
> >         </attrib>
> >     </product>
> >     <product>
> >         <attrib name="P">product 2</attrib>
> >         <attrib name="Names">
> >             <rs>
> >                 <row firstname="Sam"/>
> >                 <row firstname="Ron"/>
> >                 <row firstname="Sam"/>
> >                 <row firstname="Ron"/>
> >             </rs>
> >         </attrib>
> >     </product>
> >     <product>
> >         <attrib name="P">product 3</attrib>
> >         <attrib name="Names">
> >             <rs>
> >                 <row firstname="Ron"/>
> >                 <row firstname="Sam"/>
> >                 <row firstname="Joe"/>
> >                 <row firstname="Sam"/>
> >
> >             </rs>
> >         </attrib>
> >     </product>
> > </prods>
> >
> > ----------------------------------------------------
> > This is the OUTPUT that I want (note no name dups):
> > ----------------------------------------------------
> >
> > <ns:Products xmlns:ns="http://w.ns.c/ns/prod/";>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Bill</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Sam</ns:name>
> >             <ns:name>Ron</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Ron</ns:name>
> >             <ns:name>Joe</ns:name>
> >             <ns:name>Sam</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> > </ns:Products>
> >
> >
> > ----------------------------------------------------
> > But this is the OUTPUT that I get (note the name dupes):
> > ----------------------------------------------------
> > <ns:Products xmlns:ns="http://w.ns.c/ns/prod/";>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Bill</ns:name>
> >             <ns:name>Bill</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Sam</ns:name>
> >             <ns:name>Ron</ns:name>
> >             <ns:name>Sam</ns:name>
> >             <ns:name>Ron</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> >     <ns:Product>
> >         <ns:Names>
> >             <ns:name>Ron</ns:name>
> >             <ns:name>Sam</ns:name>
> >             <ns:name>Joe</ns:name>
> >             <ns:name>Sam</ns:name>
> >         </ns:Names>
> >     </ns:Product>
> > </ns:Products>
> >
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