Representing IP addresses in XML Schema

Roger L. Costello costello at
Tue Dec 21 11:43:47 GMT 1999

Ray Waldin wrote:
> "Roger L. Costello" wrote:
> > ...
> > <datatype name="IP" source="string">
> >    <pattern value="\d{3}.\d{3}.\d{3}.\d{3}"/>
> > </datatype>
> >
> > However, this is not satisfactory - it allows each field in the IP to
> > have values from 000-999.  I want to restrict the possible values to:
> > [0-255].[0-255].[0-255].[0-255]
> You can avoid the problem by storing the IP as a hex address, as in:
> ff.ff.ff.ff
> <pattern
> value="[0-9a-f][0-9a-f].[0-9a-f][0-9a-f].[0-9a-f][0-9a-f].[0-9a-f][0-9a-f]"/>
> -Ray

Thanks Ray.  An interesting choice of words - "You can avoid the
'problem' ...".  I think that it is a "problem" if such a common, simple
datatype cannot be expressed directly, and one is forced to resort to
indirect means of expressing what is desired.  Yes?  /Roger

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