Representing IP addresses in XML Schema

Leigh Dodds ldodds at
Tue Dec 21 12:28:46 GMT 1999

> > > 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
> > 
> 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

It also becomes trickier if you want to disallow IP addresses such 
as,, etc.


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