Bug in Solution to Representing IP addresses in XML Schema

Roger L. Costello costello at mitre.org
Wed Dec 22 18:19:11 GMT 1999

I just realized that there is a bug in the solution that I mailed this
morning.  The period (.) is a special character meaning "any
character".  To indicate that we want a period and not "any character"
the period must be escaped with a backslash, i.e., \. 

Here's the fixed solution:

<datatype name="IP" source="string">
    <pattern value="((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 practive the R.E.
              would all be on one line.

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