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RE: Who can implement W3C XML Schema ?

  • To: <Jiri.Jirat@s...>,"Eric van der Vlist" <vdv@d...>
  • Subject: RE: Who can implement W3C XML Schema ?
  • From: "Dare Obasanjo" <dareo@m...>
  • Date: Wed, 20 Mar 2002 11:53:08 -0800
  • Cc: <xml-dev@l...>
  • Thread-index: AcHQHknATral7ZtwSPusLvnfD8KhlAAKMfBA
  • Thread-topic: Who can implement W3C XML Schema ?

has invalid child element
Your email shows exactly what's wrong with how people use XML Schema
today and the why such an obtuse recommendation (the structures part,
the datatypes section is rather decent as is the non-normative primer)
is a problem. 

If a schema fails to validate in your favorite parser, then try it one
or two others and if results are inconsistent then bring it up in a
newsgroup or on a mailing list instead of just giving up and assuming
that there is some hidden flaw in the schema that can't be discovered. 

These are the errors I get with XmlValidatingReader in .NET

[Validation error] Element 'AAA' has invalid child element
jiratj/:a'. An error occurred at empty.xml(3, 45).
[Validation error] The 'http://www.zvon.org/jiratj/:a' element is not
An error occurred at empty.xml(3, 45).
while MSXML says 

[Validation Error] Element Conetent is Invalid According to DTD/Schema 

I will never build only one of anything important. All important systems
have redundant control panels and power supplies. For the same reason I
always carry at least two fully loaded weapons at all times.

> -----Original Message-----
> From: Jiri Jirat [mailto:Jiri.Jirat@s...] 
> Sent: Wednesday, March 20, 2002 6:48 AM
> To: Eric van der Vlist
> Cc: xml-dev@l...
> Subject: Re:  Who can implement W3C XML Schema ?
> Eee,
>   Xerces-J is not too bad, but I have spent many hours
> with the following example, trying to figure out, what's wrong:
> <AAA xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> xmlns:jj="http://www.zvon.org/jiratj/" 
> xsi:noNamespaceSchemaLocation="correct_0.xsd"><jj:a/></AAA>
> schema (correct_0.xsd):
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
> xmlns:jj="http://www.zvon.org/jiratj/" 
> xmlns:html="http://www.w3.org/TR/REC-html40">
>       <xsd:element name="AAA">
>        <xsd:complexType>
>         <xsd:complexContent>
>          <xsd:restriction base="xsd:anyType"/>
>         </xsd:complexContent>
>        </xsd:complexType>
>       </xsd:element>
>       </xsd:schema>
> The schema should specify an element, which is empty, am I right?
> See:
> http://www.w3.org/TR/xmlschema-0/#emptyContent
> and your article somewhere on XML.com :-)
> But both xsv and Xerces-J haven't say even "boooo!" and where 
> happy :-(
> (I am using Xerces 2.0.0, the xsv is some month old)
> Or am I overlooking something?
> Regards
> Jirka
> Eric van der Vlist wrote:
> > Good points, Jonathan.
> > 
> > Jonathan Robie wrote:
> > 
> >> 1. Let's figure out which implementations do a 
> particularly good job
> >> of implementing XML Schema. If there are one or two that 
> are really 
> >> good, that would be very useful information, even if there 
> are a bunch 
> >> that are not good. Let's make compatibility a marketable commodity.
> > 
> > 
> > According to my experience which is absolutely not 
> exhaustive since I
> > have been using mainly only tools running on my laptop (Linux) and 
> > tested on the examples which are included in my book (to 
> come) about W3C 
> > XML Schema, the most complete and conform implementation is by far 
> > Xerces-J.
> > 
> > I have also found their developers very active in fixing 
> bugs as soon 
> > as
> > you report one.
> > 
> > Again, it's not exhaustive, but kudus for Xerces-J!
> > 
> > Eric
> -- 
>   <name firstName="Jirka" surname="Jirat"/>
>   <mail>     jiratj@s...  </mail>
>   <support>  http://www.zvon.org </support>
>   <zvonMailingList> http://www.zvon.org/index.php?nav_id=4 
> </zvonMailingList>
> -----------------------------------------------------------------
> The xml-dev list is sponsored by XML.org 
> <http://www.xml.org>, an initiative of OASIS 

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