Get line/column number from DOM Nodes

Hello,
I'm currently writing an xml editor application.
I want to select the lines of a specified org.w3c.dom.Node or Element when the user selects a Node from a tree, so I must have the line and column number of the selected Node.
I know I can get the location via the Locator during SAX parsing but I need a DOM tree. Of course i could create my own dom classes but then I'd had to rewrite a lot of code and my xpath evaluator (wich currently uses, of course, also w3c.dom classes) won't work together with it.
I'm surely not the first one who needs this function, so there must be a possibility to figure it out. I thought about hacking xerces but probably it was a bad idea.
I hope anyone knows a solution or even a totally other way.
Thanks,
Roar

You might want to look at:
http://cvs.sourceforge.net/viewcvs.py/armedbear-j/j/j/src/org/armedbear/j/XmlParserImpl.java?rev=1.7&view=auto
In general, DOM is not designed for editors, but for applications dealing with XML as an object model, where the lexcal details don't matter.
You could subclass whatever builds the DOM tree from SAX events and add either user data (if using DOM level 3) or and entry in an IdentityHashMap (if not) to the created nodes. You also need to add LexicalHandler support if you want to go into the detail of CDATA sections etc.
Pete

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