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Re: Inconsistent defn of PSVI Contributions for attribute information items

From: Jeni Tennison <jeni@jenitennison.com>
Date: Thu, 13 Dec 2001 09:43:54 +0000
Message-ID: <9864435293.20011213094354@jenitennison.com>
To: Stanley Guan <Stanley.Guan@oracle.com>
CC: Schema XML <xmlschema-dev@w3.org>
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 04:44:01 GMT

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