How parser maintains and XML tree

Hello All,

I was just wondering that the xslt parsers use DOM
structure and I am still not convinced that the parser
would be able to maintain a large XML tree say, 50Mb
or more. 
It will show the Out of memory problems, if this is
the case then what is the solution for this problem? 
Otherwise in case it works for large XML struct. then
how do they maintain in the memory?????

Any ideas ??????


Thanks
Dennis


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