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RE: tool support schema for xs:extension or a way to replace i

• To: "'CAUBEL, Hugues'" <hugues.caubel@a...>,<xml-dev@l...>
• Subject: RE: tool support schema for xs:extension or a way to replace it
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Mon, 26 Jul 2004 22:00:48 +0100
• In-reply-to: <8D6581C22F494340878EF8F6A0EBABB31CDE8C@F...>
• Thread-index: AcRzGrKu6ytUjGh9RRqMwpcTkbmOHQADRHGQAACggYAACgDRwA==

It's true that schema processors don't always agree on whether a schema is
valid. However, I think the differences tend to be:

(a) some processors enforce the rules more rigorously than others (for
example, Saxon 8.0 seems to apply the rules on what constitutes a valid
restriction more rigorously than Xerces does; it also enforces the revised
syntax for regular expressions in the second edition of Schema 1.0).

(b) some processors omit support for obscure features (for example, Saxon
doesn't yet support xs:notation)

(c) processors interface differently with their environment (for example
instance document validation is invoked in different ways)

For these reasons it's always a good idea to check that your schema
validates with several processors (and if you intend your schema to be used
by many organizations, to check it with *all* the mainstream processors).

But among the mainstream processors, you can rely on major facilities like
xs:extension being implemented.

Michael Kay  


> 
> Sorry, i don't explain my problem clearly. I know that 
> xs:extension is part of the specification, but i've read 
> there is some problems with tool support of schema (like in 
> this thread 
> http://lists.xml.org/archives/xml-dev/200311/msg00871.html), 
> and i'm wondering if i'm going to facing troubles. So I would 
> like to know if some of you have some feedbacks on the 
> support of xs:entension in tool (as i don't have the ability 
> to say which tool will use theses Schemas). 
> May be there is no problem (i hope so) - and my question is 
> too paranoiac :) 
> 
> If i take the previous sample and translate ii in the 
> xs:extension way, it would give something like  this :
> 
> - initial structure with mix elements and attributes
> 
> <xs:complexType name="groupGeneralType">
> 	<xs:sequence>
> 		<xs:element name="elt1">
> 			<xs:complexType>
> 				<xs:sequence maxOccurs="unbounded">
> 					<xs:element name="elt2" 
> type="anotherType"/>			     
> 					<xs:element name="elt3" 
> type="xs:string"/>
> 				</xs:sequence>
> 			</xs:complexType>
> 		</xs:element>
> 	</xs:sequence>
> 	<xs:attribute name="att1"  type="xs:string" use="optional"/>
> </xs:complexType>
> 
> - and after that, other people will extend it in this way :
> 
> <xs:complexType name="userType">
> 	<xs:complexContent>
> 		<xs:extension base="groupGeneralType">
> 			<xs:sequence>
> 				<xs:element name="eltuser1"/>
> 			</xs:sequence>
> 			<xs:attribute name="attuser1" 
> type="xs:string" use="optional"/>
> 		</xs:extension>
> 	</xs:complexContent>
> </xs:complexType>
> 
> 
> > -----Original Message-----
> > From: Michael Kay [mailto:michael.h.kay@n...]
> > Sent: 26 July 2004 17:48
> > To: CAUBEL, Hugues; xml-dev@l...
> > Subject: RE:  tool support schema for xs:extension 
> > or a way to
> > replace it
> > 
> > 
> > xs:extension is a standard feature of XML Schema (perhaps you 
> > are misled by
> > its name?) so every XML Schema processor should support it.
> > 
> > Michael Kay 
> > 
> > > -----Original Message-----
> > > From: CAUBEL, Hugues [mailto:hugues.caubel@a...] 
> > > Sent: 26 July 2004 15:13
> > > To: xml-dev@l...
> > > Subject:  tool support schema for xs:extension or a 
> > > way to replace it
> > > 
> > > Sorry, misclick.... i finish my previous post.
> > > 
> > > I would like to know if you have some feedback on the support 
> > > of tool (parser, editor) for schema that use xs:entension. It 
> > > seems fine with xmlSpy, Xerces and XSV, but may be it is not 
> > > always the case with other tool (specially wheen looking at 
> > > http://sdec.reach.ie/rigs/rig0004/html/)
> > > 
> > > In the beginning to avoid risk, i was looking for a way to 
> > > use xs:group to do the same kind of task - but i could not do 
> > > it, as i want something like 
> > > 
> > > <xs:group name="custGroup">
> > >  <xs:sequence>
> > >   <xs:element name="elt1" type="xs:string"/>
> > >   <xs:element name="elt2" type="xs:string"/>
> > >   <xs:element name="elt3" type="xs:string"/>
> > >  </xs:sequence>
> > >  <xs:attribute name="att1" type="xs:string"/>	
> > > </xs:group>
> > > 
> > > but it is not legal to mix attributes and elements. 
> > > 
> > > Any ideas (and sadly i could not use relaxNG) ?
> > > 
> > > Thanks, hugues
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
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  • RE: tool support schema for xs:extension or a way to replaceit
    • From: "CAUBEL, Hugues" <hugues.caubel@a...>

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