Representing IP addresses in XML Schema

[Ray Waldin]

"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

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