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Re: Inconsistent defn of PSVI Contributions for attribute information items

From: Stanley Guan <Stanley.Guan@oracle.com>
Date: Thu, 13 Dec 2001 10:03:04 -0800
Message-ID: <3C18ED58.35BE17E4@oracle.com>
To: Schema XML <xmlschema-dev@w3.org>
Jeni,

Thank you for your excellent summary.  For a casual reader like me,
there are too many hidden messages in the spec. that I was not able
to figure out by myself without spending lots of time :-(.

Thx,

-Stanley

Jeni Tennison wrote:

> Hi Stanley,
>
> > In 3.2.5 Attribute Declaration Information Set Contributions, it states:
> >
> >   [schema normalized value]
> >   The normalized value of the item as validated.
> >
> > while, in 3.4.5 Complex Type Definition information Set Contributions,
> > it states:
> >   [schema normalized value]
> >   The canonical lexical representation of the {value constraint} value.
>
> Section 3.2.5 is talking about what the information set contains when
> there's actually an attribute in the instance document, whereas
> Section 3.4.5 is talking about what the information set contains when
> there's *not* an attribute in the instance document, but there is a
> {value constraint} (i.e. a default or fixed value).
>
> Look a little bit above the tables, at the beginning of the sections,
> and in Section 3.2.5 you'll see:
>
>   If the schema-validity of an attribute information item has been
>   assessed as per Schema-Validity Assessment (Attribute) (§3.2.4),
>   then in the post-schema-validation infoset it has properties as
>   follows:
>
> Whereas in Section 3.4.5 you'll see:
>
>   For each attribute use in the {attribute uses} whose {required} is
>   false and whose {value constraint} is not ·absent· but whose
>   {attribute declaration} does not match one of the attribute
>   information items in the element information item's [attributes] as
>   per clause 3.1 of Element Locally Valid (Complex Type) (§3.4.4)
>   above, the post-schema-validation infoset has an attribute
>   information item whose properties are as below added to the
>   [attributes] of the element information item.
>
> What it's basically saying is that the [schema normalized value] is
> the normalized value of the attribute if it's present in the instance,
> and the canonical lexical representation of the fixed or default value
> if the attribute isn't present in the instance.
>
> Cheers,
>
> Jeni
>
> ---
> Jeni Tennison
> http://www.jenitennison.com/
Received on Thursday, 13 December 2001 13:03:15 GMT

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