title: what is the importance of xml schema?
body: <p>hi I have created an XML file but now I have to create an XML schema.Can you guys tell me the importance of schema and the meaning of the line code.</p>
  
  <p><code>&lt;xs:schema xmlns:xs="http://www.abc.org/2010/XMLSchema"&gt;</code></p>
  
  <p>from where would I get the url just like above?</p>