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Solution2: Representing IP addresses in XML Schema

• From: "Roger L. Costello" <costello@m...>
• To: xml-dev@i..., "Etkind,Wendy C." <etkind@m...>, "Schneider,John C." <jcs@m...>, "Cokus,Michael S." <msc@m...>, JTauber@b...
• Date: Wed, 22 Dec 1999 14:19:52 -0500

Andrew Greene pointed out that the regular expression was allowing
things like 08 and 09 to appear as a field in the IP, and many (all?)
implementations treat a number beginning with "0" as an octal value. 
Here's the latest solution, containing the R.E. that Andrew sent to me
which does not have this deficiency: (thanks Andrew!)

<datatype name="IP" source="string">
    <pattern value="(([1-9]?[0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}
                     ([1-9]?[0-9]|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 practice the R.E.
              would all be on one line.
          </info>
       </annotation>
    </pattern>
</datatype>


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