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J.Pietschmann
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Re: [xsl] Problem with constructing a tree
Subject: Re: [xsl] Problem with constructing a tree From: "J.Pietschmann" <j3322ptm@xxxxxxxx> Date: Sat, 27 Jul 2002 10:04:41 +0200 |
Yash wrote:
Hi, I have a problem where I need to construct a tree from an xml file: The xml file looks like this: <feeAgreement> <feeClauses clauseid="1" rootclause="false"> <computationUnit name="xxxx"> <complexComputationUnit clauseid="2"/> </computationUnit> </feeClauses> <feeClauses clauseid="2" rootclause="false"> <computationUnit name="yyyy"> <complexComputationUnit clauseid="3"/> </computationUnit> </feeClauses> <feeClauses clauseid="3" rootclause="false"> <computationUnit name="zzzz"> <complexComputationUnit clauseid="1"/> </computationUnit> </feeClauses> </feeAgreement>
Now, I would like to typically use recursion to construct the tree, starting at the first feeClauses element. When I get to the complexComputationUnit element's clauseid attribute, I would like to go over and find the clause with the clauseid specified here. The problem is, I need to know if the clause is already present, as in the case of clause 3, which refers to clause 1. Here, I need not get the first clause. I cannot seem to think of a way of checking while transforming whether I have the clause already in the transformed part. Any help would be greatly appreciated.
You have a cycle in your dependencies. You can check for this by keeping the elements you already visited in a parameter
<xsl:template name="do-tree"> <xsl:param name="node"/> <!-- set of visited nodes --> <xsl:param name="visited"/> <!-- process the currenttly visited node --> <xsl:copy-of select="$node"/> <!-- get referenced node --> <xsl:variable name="referenced" select="//feeClauses[ @clauseid=$node/cumputationUnit/complexComputatioUnit/@clauseid]"/> <!-- check whether the referenced node has been visited --> <xsl:if test="count($referenced|$visited)!=count($visited)"> <xsl:call-template name="do-tree"> <xsl:with-param name="node" select="$referenced"/> <!-- don't forget to add the referenced node to the visited list --> <xsl:with-param name="visited" select="$referenced|$visited"/> </xsl:call-template> </xsl:if> <xsl:template>
J.Pietschmann
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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