search xml content (not tags/elements) *before* parsing

Is it possible to search the contents of an XML file before its parsed ideally using java?

Can the same be done to a HTML/XHTML file.

My setup:
Language used is Java with a DOM parser (xerces).

Im Downloading XML/HTML files with structure and elements unknown (they'll be random xml/html files).

I want to be able to search file contents, not for tag/elements names (content will be small, typically 3000 words or less) before i parse in order to save time.

Is this possible , How?

If not whats the best way to search after parsing ? can it be done with DOM/xerces ?

The idea is to specify a number of keywords and search for them within the xml file ... if the keywords appear then to parse the xml file and save the content to the local drive.

Thanks

try this one for the search facility
http://www.gre.ac.uk/~tk301/3dmm/search.html

then you would have to add an if statement that if match is found then do something else

but i'm pretty sure it has to load the file anyway to search it