Subject: Re: [xsl] Connecting the Source and Destination fields From: Ronan Klyne <ronan.klyne@xxxxxxxxxxx> Date: Wed, 29 Aug 2007 12:26:32 +0100 |
Yaswanth wrote: > Hi can you please explain me what exactly the below line is doing and how it > is working? > > <xsl:for-each > select="/root/connection[not(/root/connection/@destination = @source)]"> First, some facts: * If a connection has a destination that does not equal the source of any other connection, then it is and the end of the chain. * If a connection has a source that does not equal any other connection's destination, then it is the start of the chain. /root/connection[not(/root/connection/@destination = @source)] This line is designed to select all the nodes that represent the start of a chain. It does this by expressing the above statement in XPath: "If a connection has a source that does not equal any other connection's destination, then it is the start of the chain." So, we want to select connections: /root/connection with a source attribute: /root/connection[@source] that does not equal any connection's destination: /root/connection[not(/root/connection/@destination = @source)] I hope this explains it... # r -- Ronan Klyne Business Collaborator Developer Tel: +44 (0)870 163 2555 ronan.klyne@xxxxxxxxxxx www.groupbc.com
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