Solution to Representing IP addresses in XML Schema

[Roger L. Costello]

Hi Folks,

Below is the solution to creating an XML Schema datatype to represent IP
numbers.  Thanks to all those who responded, especially Robert Hanson
who came up with the solution.  /Roger

<datatype name="IP" source="string">
   <pattern value="((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5]).){3}
                    (1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])"/>
      <annotation>
         <info>
             Datatype for representing IP addresses.  Examples,
                129.83.64.255, 64.128.2.71, etc.
             This datatype restricts each field of the IP address
             to have a value between zero and 255, i.e.,
                [0-255].[0-255].[0-255].[0-255]
             Note: in the value attribute (above) the regular
             expression has been split over two lines.  This is
             for readability purposes only.  In practive the R.E.
             would all be on one line.
         </info>
      </annotation>
   </pattern>
</datatype>


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