Hi Bob,
I'm not certain you're quite right in your response to Paul's second
question. From 3.3.1 of the Schema PR:
{value constraint}
establishes a default or fixed value for an element. If default is
specified, and if the element being
?validated
is empty, then the canonical form of the supplied constraint value becomes
the
[schema normalized value]
of the
?validated
element in the post-schema-validation infoset. If fixed is specified, then
the element's content must either be empty, in which case fixed behaves as
default,
or its value must match the supplied constraint value.
To my mind, this implies that if an element isn't there it's default value
doesn't get used; if it is present and is empty, then its default value
*is* used. What do you think?
Cheers,
Neil
Neil Graham
XML Parser Development
IBM Toronto Lab
Phone: 416-448-3519, T/L 778-3519
E-mail: [EMAIL PROTECTED]
Bob Schloss/Watson/[EMAIL PROTECTED] on 04/11/2001 06:47:07 PM
Please respond to [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: default values for elements
Paul Jakubik asked questions about xml schema.
Presumably, FAQs and tutorials about the Schema language
will be appearing over the next month. There is a promise
that the FAQ located at
http://www.chronocell.com/faq/xml-schema.html
is going to get a significant update next week.
If your question is not answered by a FAQ,
the best place to get those questions answered is by posting
to the following list:
[EMAIL PROTECTED]
For questions of the form: One part of one schema spec
says A, but another part of another schema spec doesn't
mention A or says something contractory, those questions
should be posted to:
[EMAIL PROTECTED]
I will express my own opinion on some of your questions.
Paul Jakubik asked:
> 2) When exactly is the default value used? Is it
> only when the element does not appear at all?
Yes.
> Is it also
> used when the element appears, but is empty?
No.
> 3) What is considered an empty element? Are any of
> the following Foo elements empty?
> <Foo/>
Yes - this is empty.
> <Foo></Foo>
Yes - this is empty.
> <Foo> </Foo>
No - this is not empty.
Bob Schloss
IBM T. J. Watson Research Center
Yorktown Heights, New York, USA
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