RE: Ref XSCH-QL-018: Example of pblm with serialization-based validation

I don't think that there is a requirement to preserve the value in a
pattern compatible way even if we would preserve the type. So I do not
think that "Alternative 1" has anything to do with this issue.

Best regards
Michael

> -----Original Message-----
> From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> request@w3.org] On Behalf Of Michael Kay
> Sent: Saturday, March 06, 2004 1:42 PM
> To: 'Henry S. Thompson'; public-qt-comments@w3.org
> Subject: RE: Ref XSCH-QL-018: Example of pblm with serialization-based
> validation
> 
> 
> This problem is certainly a known one. But it's not serialization that
> causes the problem, it's the fact that the constructs that create
nodes on
> the result tree (in both XSLT and XQuery) convert values to strings
and
> discard the type information. (The infamous "Alternative 1".)
> 
> Michael Kay
> 
> # -----Original Message-----
> # From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> # request@w3.org] On Behalf Of Henry S. Thompson
> # Sent: 06 March 2004 15:11
> # To: public-qt-comments@w3.org
> # Subject: Ref XSCH-QL-018: Example of pblm with serialization-based
> # validation
> #
> #
> # Consider the following schema document and instance:
> #
> # <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
> #  <xs:element name="root">
> #   <xs:simpleType>
> #    <xs:restriction base="xs:decimal">
> #     <xs:annotation>
> #      <xs:documentation>Always two signif. digits</xs:documentation>
> #     </xs:annotation>
> #     <xs:pattern value=".*\..."/>
> #    </xs:restriction>
> #   </xs:simpleType>
> #  </xs:element>
> # </xs:schema>
> #
> # <root>3.00</root>
> #
> # The instance is valid per the schema corresponding to the schema
> document.
> #
> # A query which attempted to construct an element including this one
> # would however fail, as I read the spec., because the serialization
> # would include <root>3.0</root>, which is invalid per the type.
> #
> # ht
> # --
> #  Henry S. Thompson, HCRC Language Technology Group, University of
> # Edinburgh
> #                      Half-time member of W3C Team
> #     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131
650-4440
> #             Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
> #                    URL: http://www.ltg.ed.ac.uk/~ht/
> # [mail really from me _always_ has this .sig -- mail without it is
forged
> # spam]
>

Received on Saturday, 6 March 2004 16:44:31 UTC