• To: "Henry S. Thompson" <ht@i...>
• Subject: Re: Is it correct schema definition?
• From: Kasimier Buchcik <K.Buchcik@4...>
• Date: Mon, 05 Dec 2005 19:20:15 +0100
• Cc: ML-xml-dev <xml-dev@l...>
• In-reply-to: <f5b64q3ihhe.fsf@e...>
• References: <EDBEE001298F534EBCFEE2C1B4FAC86D9B8F89@m...> <f5b64q3ihhe.fsf@e...>

Hi,

On Mon, 2005-12-05 at 17:25 +0000, Henry S. Thompson wrote:
> Li Yuejiong(John) writes:

[...]

> >   <element id="id_Afghanistan" name="Afghanistan" type="countryItemType"
> > substitutionGroup="CountryItemHead" fixed="" nillable="true" />

[...]

> Also, under the circumstances, 'nillable="true"' is pointless, as it
> means elements validated by that decl _may_ be empty even if their
> type doesn't allow that, but the type _does_ allow that, so . . .

If an xsi:nil="true" gives the extra information that the element is NIL
via PSVI, then this is not pointless, since NIL is different from an
empty element. I guess that's the most wanted effect of xsi:nil:
providing a way of expressing a content of NIL.

[...]

Regards,

Kasimier

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