Hi, Thanks David for your quick reply.
>From your description I can see the third solution is more suitable as this could manipulate the nodes and update the original DOM and thus the original xml. As I've just started my xerces/xalan coding, it would be greatful if you could point any samples for this. Thanks, Arun Ramachandran. -----Original Message----- From: David Bertoni [mailto:dbert...@apache.org] Sent: Friday, May 22, 2009 4:28 PM To: xalan-c-users@xml.apache.org Subject: Re: Manipulating the xpath expression to reflect the data modified in the original xml. ramachandran_a...@emc.com wrote: >> Hi, >> >> I'm using xerces-C++ [version-2.7.0] and xalan-c++ [version-1.10.0] in >> my application. >> >> AIM: Open an xml, query the xpath expression to get the nodes and >> change the values provided by user in a seperate structure in the >> nodes evaluated from the xpath query. I could get the xml node related >> to the xpath expression in a XObjectPtr. I can see samples how to read >> the data to display from this xpath evaluation. But I'm not sure about >> how to manipulate the data and put it back into the original xml. XPath does not have any "write" semantics, so you cannot use XPath to do this. You might consider using an XQuery implementation like Xqilla on top of the Xerces-C DOM. Another choice is to express the modifications as an XSLT stylesheet that you generate using the XPath expressions. That could become very complicated, unless you want to limit the complexity of the XPath expressions you allow. A third choice is to use the Xerces-C DOM, and Xalan-C's wrapper around it to find nodes in the Xerces-C DOM using XPath expressions. You can then modify the underlying DOM as appropriate. All of these choices have pluses and minuses. Because your initial problem description is very vague, it's difficult to say what would be the best choice. Dave
