hi plazmo,

You can only edit an xml file by loading it completelely.

Since many users hit this xml file , there is every possibility of data loss.

If you want to view only a small content from the xml file, write an xsl file to show only what is needed.

So you can alwasy access the xslt file which gets only the required content and displays it.
But in order to edit, you have to load the entire xml file.
To remove conflicts, it's better you keep this xml file in an ASP page and access the asp page. Then we can make it mandatory that only one person at a time can access the xml file.
please feel free to mail your concerns.

Thanks,
Chaitanya.