Salut Pete, Henry, George,
 
I will follow all the leads you all gave me. This is a great mailing =
list!!!
Thanks a lot for your help!
 
Best regards, Wolf

-----Original Message-----
From: xmlschema-dev-request@w... =
[mailto:xmlschema-dev-request@w...]On Behalf Of Pete Hendry
Sent: Donnerstag, 23. Juni 2005 14:19
To: xmlschema-dev@w...
Subject: Re: NewBie Question


The weakness here is that you rely on the sender adding xsi:type to the =
instance to get validation. If you do not control the sender then this =
could be a problem. You will not know whether the parser validated each =
element or not unless you check that xsi:type is present on each which =
would likely mean you have to parse to DOM and check each place where =
this could be present in the instance. That is, if you require =
validation. If you don't then it doesn't matter.

The general problem with this approach is that the schema defines a =
contract on the document. The contract being defined would say that any =
element is allowed but there is no way to say that only elements of a =
specific type are allowed. So the contract being defined is not specific =
enough to use the schema without out-of-band information.

Pete

Henry S. Thompson wrote: 

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Hash: SHA1



H=E4mmer Wolfgang writes:



  

I don't know these name in advance.

    



Another option is to use xsi:type in the instance -- see the XML

Schema Primer, particularly section 4.7 [1] (but you don't want to

make your type abstract).  You'll end up with e.g.



 <TableDropBanana xsi:type="CommonType">

  ...

  <LocalVariables>...</LocalVariables>

 </TableDropBanana>



Ultimate fallback is to use lax validation and give LocalVariables a

top-level declaration, and at least it and its contents will get

validated properly.



ht



[1]  http://www.w3.org/TR/xmlschema-0/#abstract

- -- 

 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@i...

                   URL:  http://www.ltg.ed.ac.uk/~ht/

[mail really from me _always_ has this .sig -- mail without it is forged =
spam]

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