Comparing between MySQL and XML

hye,

i am developing a webservice on the solaris platform. i am 
going to compare between mySQL database and XML for 
storing data. 
the webservice sits between the client browser and the 
database/xml. The browser will be sending request to the 
webservice in xml format. However, i am undecided what 
language to use to connect between webservice and 
database/xml. added complexity is the request will have to 
be used to derive sql statements to query database and i 
am not sure what to use to query XML file.


Any ideas?
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