XML Schema Question

Henry S. Thompson ht at cogsci.ed.ac.uk
Sun Jan 2 18:32:32 GMT 2000

Brett McLaughlin <bmclaugh at algx.net> writes:

> My understanding is for XML like this:
> <?xml version="1.0"?>
> <myNamespace:Doc xmlns="Schema/mySchema.xsd" 
>                  xmlns:myNamespace="http://someUrl.com"
> >
>   <myNamespace:element1>
>     <myNamespace:element2 />
>   </myNamespace:element1>
>   <myNamespace:element3>Some content</myNamespace:element3>
> </myNamespace:Doc>
> the myNamespace namespace is of course associated with
> http://someUrl.com.  And the schema for the document that would be used
> for validation would be Schema/mySchema.xsd, as defined in the default
> namespace.  Is that correct?  I know that was the previous version...

This is not quite the right approach.  The default namespace
declaration is doing no work, and is unlikely to yield the right

The preferred approach is as follows:

 <myNamespace:Doc xmlns:xsi="http://www.w3.org/1999/XMLSchema/instance" 

The following would also work, in a context where dereferencing
namespace URIs is mandated/encouraged.


but would require that you use your schema URL as your namespace URI.

> And in my schema (here's where everything changed):
> <?xml version="1.0"?>
> <!DOCTYPE schema
>     PUBLIC 
>       "-//W3C//DTD XML Schema Version 1.0//EN"
>     SYSTEM 
>       "http://www.w3.org/TR/1999/WD-xmlschema-1-19991217/structures.dtd"
> >
> <schema targetNamespace="http://someUrl.com"
>         xmlns="http://www.w3.org/1999/XMLSchema"
>         xmlns:myNamespace="http://someUrl.com"
> >
>   <element name="element1" type="myNamespace:element1Type" />
>   <type name="element1Type">
>     <element name="element2">
>       <type content="empty" />
>     </element>
>   </type>
>   <element name="element3" type="string" />
> </schema>
> That would be right, as I can tell.  My only unsurety is whether it is
> correct to omit the namespace before each element's name (in a DTD, of
> course, this has to be myNamespace:element1 and myNamespace:element2). 
> As far as I can tell, the element is defined, and the namespace listed
> in targetNamespace is then applied to all elements named.  That would be
> why the type element1Type must be referred to as
> myNamespace:element1Type in the definition of the element1 element,
> correct?  The namespace is applied to it.  So can someone let me know if
> I am reading this right, or if I'm off in left field somewhere ;-)

The schema is all correct, and your analysis of the namespace story in 
the schema is correct (see also my message on this subject yesterday [1]).


[1] http://www.lists.ic.ac.uk/hypermail/xml-dev/xml-dev-Jan-2000/0013.html
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht at cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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