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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Pairing of nodes
 Hi xsl-list, This is my first post to this list. I hope I will get positive replies to my first post. 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> <!--Gateway 3--> <Gateway> <ID>ID-001</ID> <Type>T002</Type> </Gateway> <!--Gateway 4--> <Gateway> <ID>ID-003</ID> <Type>T001</Type> </Gateway> <!--Gateway 5--> <Gateway> <ID>ID-001</ID> <Type>T003</Type> </Gateway> ... </Gateways> 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, My output XML will be: <!--Pair between Gateway1 and Gateway2--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-002</Tail> </GatewayPair> <!--Pair between Gateway1 and Gateway3--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway1 and Gateway4--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-003</Tail> </GatewayPair> <!--Pair between Gateway1 and Gateway5--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway2 and Gateway1--> <GatewayPair> <Head>ID-002</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway2 and Gateway3--> <GatewayPair> <Head>ID-002</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway2 and Gateway4--> <GatewayPair> <Head>ID-002</Head> <Tail>ID-003</Tail> </GatewayPair> <!--Pair between Gateway2 and Gateway5--> <GatewayPair> <Head>ID-002</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway3 and Gateway1--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway3 and Gateway2--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-002</Tail> </GatewayPair> <!--Pair between Gateway3 and Gateway4--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-003</Tail> </GatewayPair> <!--Pair between Gateway3 and Gateway5--> <GatewayPair> <Head>ID-001</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway4 and Gateway1 --> <GatewayPair> <Head>ID-003</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway4 and Gateway2 --> <GatewayPair> <Head>ID-003</Head> <Tail>ID-002</Tail> </GatewayPair> <!--Pair between Gateway4 and Gateway3 --> <GatewayPair> <Head>ID-003</Head> <Tail>ID-001</Tail> </GatewayPair> <!--Pair between Gateway4 and Gateway5 --> <GatewayPair> <Head>ID-003</Head> <Tail>ID-001</Tail> </GatewayPair> ....... I hope I am clear with my problem. Relevant portion of my XSLT: <xsl:template match="/"> <GatewayData> <xsl:apply-templates select="//Gateways"/> </GatewayData> </xsl:template> <xsl:template match="//Gateways"> <xsl:for-each select="./Gateway"> <xsl:variable name="gwId"> <xsl:value-of select="ID"/> </xsl:variable> <xsl:for-each select="preceding-sibling::*"> <GatewayPair> <Head> <xsl:value-of select="$gwId"/> </Head> <Tail> <xsl:value-of select="./ID"/> </Tail> </GatewayPair> </xsl:for-each> <xsl:for-each select="following-sibling::*"> <GatewayPair> <Head> <xsl:value-of select="$gwId"/> </Head> <Tail> <xsl:value-of select="./ID"/> </Tail> </GatewayPair> </xsl:for-each> </xsl:for-each> </xsl:template> I am a newbie to XSLT, so my questions could be quite basic... Questions: 1. Is there any other way of transforming this without using 'preceding-sibling::*' and 'following-sibling::*'? 2. My code is redundant and is same in 'for loops' for 'preceding-sibling::*' and 'following-sibling::*'. How can we avoid this redundancy? 3. How can we access a variable of outer loop in the inner loop. I am doing this via defining a local variable. In my actual XML (not provided here), I have to access several variables from the outer loop, so I will end up defining lots of local variables. Thanks, Charanjeet 
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