XOM API for Processing XML with Java

[Wolfgang Hoschek <wolfgang.hoschek AT mac.com>]

If efficiency is not a concern, the XPath approaches outlined by  
Grzegorz will be easy. A perhaps more syntactically convenient  
alternative is to use the XQueryUtil.update() method. Both have the  
same effect.

However, if efficiency in terms of time and space is important, and  
alternative approach via a streaming NodeFactory is needed, finding  
the insertion point as the input document streams by, and appending  
new elements to an output xml stream. I've attached a small program  
that does the append in such a streaming manner. You might want to  
adapt it for your purposes.

But if efficiency really matters this is still not good enough  
because with file based XML, each separate append still has to scan  
the entire file to find the end, so appending many elements  
separately will be O(N^2). You'll end up having to consider better  
alternatives such as a database or B-trees such as embedded JDBM.

Wolfgang.


On Mar 2, 2007, at 1:58 AM, Narjis Malik wrote:

> Hello,
>
>
> I am working on XML files using nux and xPath, I want to append xml
> doucument at a particular location, how can I do it....
>
> I will demonstrate my question with the following example
>
> i have a xml document
> ______________________________________________________________________ 
> _____________
>
> <?xml version="1.0" encoding="UTF-8"?>
>
> <service name="GetFutureSybmolization">
>
> <synonym name="bvcvcvc">
>
> </synonym>
>
> </service>
>
> ______________________________________________________________________ 
> _______________
>
> now what i need , i want to append this xml file with new element :
>
> as i scan this xml and when there is service element with name =
> "GetFutureSybolization"
>
> then i want to add new element <synonym name="XYZDGD"></synonym>
>
> please help me how can i do it...
>
> as i tried to do it but it append at the end of file but i cant  
> append in
> some where else
>
>
>
> waiting for a reply
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