Solution2: Representing IP addresses in XML Schema

Roger L. Costello costello at
Wed Dec 22 19:18:25 GMT 1999

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}
              Datatype for representing IP addresses.  Examples,
       ,, etc.
              This datatype restricts each field of the IP address
              to have a value between zero and 255, i.e.,
              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.

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