- From: Caroline Rioux <crioux@decisionsoft.com>
- Date: Tue, 4 Mar 2003 15:18:31 +0000 (GMT)
- To: public-qt-comments@w3.org
Hi, I posted the following a few weeks ago.. if anyone could a look at this, that would be great, Caroline -- Caroline Rioux, Software Engineer +44-1865-203192 DecisionSoft Limited http://www.decisionsoft.com XML Development and Services ---------- Forwarded message ---------- Date: Wed, 19 Feb 2003 16:29:09 +0000 (GMT) From: Caroline Rioux <crioux@decisionsoft.com> To: Jonathan Robie <jonathan.robie@datadirect-technologies.com> Cc: public-qt-comments@w3.org Subject: Re: Namespace considerations Thanks for the quick reply, What I am unsure about though, is whether or not users of an XPath2 implementation can invoke constructors within either namespace? for example, if I bind xf to "http://www.w3.org/2001/XMLSchema" and xs to "http://www.w3.org/2001/XMLSchema-datatypes", then which of these (or all?) are legal? 'cast as xs:string(xs:decimal("15.5"))' 'cast as xf:string(xs:decimal("15.5"))' 'cast as xf:string(xf:decimal("15.5"))' On a different note, I thought that xs was bound to "http://www.w3.org/2001/XMLSchema" in the spec simply for convenience. You seem to imply that it is a predefined prefix which is always bound to "http://www.w3.org/2001/XMLSchema". Yet the F&O specs do use the xs: prefix for constructors, which is defined to be in the "http://www.w3.org/2001/XMLSchema-datatypes" namespace. Thanks again for your help, Caroline On Wed, 19 Feb 2003, Jonathan Robie wrote: > > Hi Caroline, > > Good question! The short answer is that you can use > ""http://www.w3.org/2001/XMLSchema-datatypes" only if you import that > schema. Even though the same set of datatypes are available under either > namespace, the datatypes in the two namespaces are not exactly identical. > If you go to the above URI, you can download the schema for datatypes, and > you will see that it looks like the following excerpt: > > <schema xmlns="http://www.w3.org/2001/XMLSchema" > targetNamespace="http://www.w3.org/2001/XMLSchema-datatypes" > version="$Id: XMLSchema-datatypes.xsd,v 1.5 2001/03/16 > 20:53:32 ht Exp $"> > > <simpleType name="string"> > <restriction base="string"/> > </simpleType> > > <simpleType name="boolean"> > <restriction base="boolean"/> > </simpleType> > <!-- SNIP --> > > For each datatype in the "http://www.w3.org/2001/XMLSchema" namespace, it > defines a new datatype in the "http://www.w3.org/2001/XMLSchema-datatypes" > namespace, deriving it from the original by trivial restriction. > > You can import this schema like any other schema. It's often easier to > simply use the predefined xs: prefix, which always points to > "http://www.w3.org/2001/XMLSchema". > > Jonathan > > At 06:13 PM 2/18/2003 +0000, Caroline Rioux wrote: > > >Hi, > > > >I need some clarification on the namespaces used for constructors and > >datatypes. > > > >In the F&O spec, section 1.5 it says: > > > >The URIs of the namespaces are: > > * http://www.w3.org/2001/XMLSchema-datatypes for constructors > > * http://www.w3.org/2002/11/xquery-operators for operators > > * http://www.w3.org/2002/11/xquery-functions for functions. > > > >Which implies that constructors are in the > >http://www.w3.org/2001/XMLSchema-datatypes namespace > > > >In XML Schema Part 2: Datatypes section 3.1 (Namespace Considerations) > > > > The ·built-in· datatypes defined by this specification are designed to be > > used with the XML Schema definition language as well as other XML > > specifications. To facilitate usage within the XML Schema definition > > language, the ·built-in· datatypes in this specification have the > > namespace name: > > > > http://www.w3.org/2001/XMLSchema > > > > To facilitate usage in specifications other than the XML Schema definition > > language, such as those that do not want to know anything about aspects of > > the XML Schema definition language other than the datatypes, each > > ·built-in· datatype is also defined in the namespace whose URI is: > > > > http://www.w3.org/2001/XMLSchema-datatypes > > > > > >Does this mean that either namespace can be used, even in the case of > >construction? > > > >Thanks for any clarification, > > > >-- > >Caroline Rioux, Software Engineer +44-1865-203192 > >DecisionSoft Limited http://www.decisionsoft.com > >XML Development and Services > > -- Caroline Rioux, Software Engineer +44-1865-203192 DecisionSoft Limited http://www.decisionsoft.com XML Development and Services
Received on Tuesday, 4 March 2003 10:16:09 UTC