"UndoMiel" <undomiele@h...> writes:

> Hi,
>
> I am looking for a way to validate IP addresses using XML Schemas. The
> following is what i used:
>
>  <xsd:simpleType name="IPType">
>       <xsd:restriction base="xsd:string">
>            <xsd:pattern value="(([1-9]?[0-9] | 1[0-9][0-9] | 2[0-4][0-9] |
> 25[0-5])\.){3}
>                                            ([1-9]?[0-9] | 1[0-9][0-9] |
> 2[0-4][0-9] | 25[0-5])"/>
>        </xsd:restriction>
>  </xsd:simpleType>
>
> I think the regular expression is correct, however an XML document with a
> valid IP address doesn't pass the validation test.

Note that valid IP addresses may not conform to the pattern you're
going for. Most notably, IPv6 patterns take a radically different
form. 

Also, although I think almost everybody uses the 127.0.0.1 format
nowadays, traditionally you could shorten the IP address (e.g., 127.1
is the same thing as 127.0.0.1). I don't know what RFC defines that,
though, and people using IPv4 can always convert to the long form, so
that's not so important. You do need to think about the IPv6
situation, though (even if you simply decide not to handle it).