Subject: Re: Merging XML From: Tom Mullen <Tom.Mullen@xxxxxxxxxxx> Date: Fri, 04 Aug 2000 08:48:58 +0000 (GMT) |
Rosh, I too am interested in such a solution. Unfortunately due to a combination of lack of time and/or skill I have not been able to pursue it to an entirely satisfactory conclusion. My initial guess would be to use a hybrid of Oliver's method and a method proposed by Jeni Tennison. For a specific format of an XML document Jeni proposed using key() to determine equivalence between nodes and then adopt a three phase approach (equivalent nodes from both the original and updated xml document are passed as parameters starting with the root document) 1) Child Nodes Removed - For each child node in the original document determine if it exists in the updated document (using key()?) 2) Child Nodes Added - For each child node in the updated document determine if it exists in the original document (using key()?) (NB this is the same template as 1) but with the node-set parameters swapped round) 3) Child Nodes amended - For each child node in the original document with an equivalent child node in the updated document call the three phase approach passing these two nodes as paramaters. The problem is generating <xsl:key..> dynamically. I've got a version working (not fully tested) that sets the <xsl:key..> with a priori knowledge of the format of the xml documents but haven't had time to extend it for a more generic solution. I have an inkling that you can't define keys dynamically so I have it in the back of my mind that a double xsl approach may need to be implemented, one to search the xml document for attributes and create an xsl key definition document that can be included into the merging tool (I have to admit that this sounds less likely to work now that I've tried to explain it) At the moment I'm plodding on (in a newbie way) and hoping that one of the more experinced members of this list may find it interesting enough to turn their attention to it. I'll test my current solution and then post it, if it will help. Thanks Tom Mullen ----------------------------------------------------------------- Visit our Internet site at http://www.reuters.com Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Reuters Ltd. XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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