How to send A file using Webservice?

I heard about webservice when I read through XML...
It a bit like XML cannot show off it strength without webservice...lol
What is webservice? What library should I use to send a file from server to client using webservice?
Webservice is Quite new for me. Any expert here can direct me to the tutorial link that can teach me how to use webservice?
I go through some code :
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://namespaces.cafeconleche.org/xmljava/ch2/"
xmlns="http://namespaces.cafeconleche.org/xmljava/ch2/"
elementFormDefault="qualified">What is xmlns? Is webservice can run it at localhost? My house don't have internet. :(
Thank....

to learn webservice..you can try these samples...
http://www.csd.abdn.ac.uk/~bscharla/teaching/CS5302/practicals/practical8.shtml

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How to send A file using Webservice?

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