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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Pairing of nodes
 > This is my first post to this list. I hope I will get positive replies
> to my first post.
Hi, a good first post - you just left out which version of XSLT you're
using, and/or which processor.
> My Input XML is:
>
> <Gateways>
> <!--Gateway 1-->
> <Gateway>
> <ID>ID-001</ID>
> <Type>T001</Type>
> </Gateway>
>
> <!--Gateway 2-->
> <Gateway>
> <ID>ID-002</ID>
> <Type>T001</Type>
> </Gateway>
> In this XML, the combination of <ID> and <Type> for a <Gateway> is
> always unique.
> Each <Gateway> has to make pair with other <Gateway>
> First Gateway will be the <Head> and second Gateway will be the <Tail>.
>
> i.e. Gateway1 will act as <Head> and make pair with Gateway2, Gateway3
> and so on....
> Gateway2 will then act as <Head> and make pair with Gateway1, Gateway3
> and so on....
So each <Gateway> is paired with another <Gateway> based on <ID> or
<Type> and the list is denormalized, which makes it easier.
I would define two keys:
<xsl:key name="gateway-by-id" match="Gateway" use="ID"/>
<xsl:key name="gateway-by-type" match="Gateway" use="Type"/>
Then in your <Gateway> template construct a list of all the <Gateway>
elements that have the same <ID> or <Type>, and then filter the list
to stop the <Gateway> matching itself:
<xsl:template match="Gateway">
<xsl:variable name="id" select="@id"/>
<xsl:variable name="thisID" select="ID"/>
<xsl:variable name="thisType" select="Type"/>
<xsl:for-each select="(key('gateway-by-id',
$thisID)|key('gateway-by-type', $thisType))[generate-id() !=
generate-id(current())]">
<GatewayPair pair="{$id}-{@id}">
<Head><xsl:value-of select="$thisID"/></Head>
<Tail><xsl:value-of select="ID"/></Tail>
</GatewayPair>
</xsl:for-each>
</xsl:template>
I've also added an "id" attribute to each <Gateway> in your source:
<Gateway id="1">
<ID>ID-001</ID>
<Type>T001</Type>
</Gateway>
<!--Gateway 2-->
<Gateway id="2">
<ID>ID-002</ID>
<Type>T001</Type>
</Gateway>
....which makes it easier to spot which pairs have been created. So
if you add id's to your source and the use the above template, you get
this result:
<GatewayData>
<GatewayPair pair="1-2">
<Head>ID-001</Head>
<Tail>ID-002</Tail>
</GatewayPair>
<GatewayPair pair="1-3">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="1-4">
<Head>ID-001</Head>
<Tail>ID-003</Tail>
</GatewayPair>
<GatewayPair pair="1-5">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="2-1">
<Head>ID-002</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="2-4">
<Head>ID-002</Head>
<Tail>ID-003</Tail>
</GatewayPair>
<GatewayPair pair="3-1">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="3-5">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="4-1">
<Head>ID-003</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="4-2">
<Head>ID-003</Head>
<Tail>ID-002</Tail>
</GatewayPair>
<GatewayPair pair="5-1">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
<GatewayPair pair="5-3">
<Head>ID-001</Head>
<Tail>ID-001</Tail>
</GatewayPair>
</GatewayData>
Is that what you needed....?
cheers
--
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/
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