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RE: How to do numeric validations in DTD

Subject: RE: How to do numeric validations in DTD
From: Mike Brown <mbrown@xxxxxxxxxxxxx>
Date: Thu, 20 Jan 2000 17:48:44 -0700
RE: How to do numeric validations in DTD
> No less ugly or off topic, but you could also do:
> <!ELEMENT personalinfo   ssn>
> <!ELEMENT ssn  (0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9)+>
> ...
> to allow ssn numbers of variable lengths.

No, the first declaration is invalid (ssn should be in parentheses), and an
XML element name/type must match the Name production and thus cannot begin
with a number. Even if it were valid, this approach would mean his XML would
look like this:


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