title: XSD pattern restriction for IP, excluding 0.0.0.0
body: <p>I'm writing an XSD with an IP type.
  I have the regex for 0.0.0.0 - 255.255.255.255 but so far I've failed to succeed with excluding 0.0.0.0</p>
  
  <p>I've tried ?!0.0.0.0, but XSD doesn't support ?!</p>