title: xs vs xsd types
body: <p>I have an xs:gmonth type that I am working on, so I was looking around to see the valid format for it and I came across 2 definitions: </p>
  
  <p><code>xsd:gmonth which accept the format --MM,
  xs:gmonth which accept the format --MM--,</code></p>
  
  <blockquote>
    <p>xs:gmonth format will not be valid for
    the xsd:gmonth format and oposit is
    correct</p>
  </blockquote>
  
  <p>.</p>
  
  <p>Can anybody please tell me what is the difference between the xs: and xsd: types? aren't they both used for XML Schema?</p>
  
  <p>Thanks a lot.</p>