RE: [xml-dev] abstract types

["CHIUSANO, Joseph" <JCHIUSANO@lmi.org>]

Tom,

W3C Schema contains a feature called Abstract Datatypes that I believe may be useful to you.  In a nutshell, abstract datatypes are complex datatypes that act as "templates" from which other complex datatypes are derived.  However, unlike base datatypes, abstract datatypes cannot be used directly in element declaration (i.e. you can declare an element to be of a type that is derived from the abstract datatype, but not of the abstract datatype itself).  

More info in section 4.7 of the W3C Schema Primer:

http://www.w3.org/TR/xmlschema-0/

Kind Regards,
Joe Chiusano
LMI 

> **************************************************************************
>   Joseph M. Chiusano
>   Logistics Management Institute
>   2000 Corporate Ridge
>   McLean, VA 22102
>   Email: jchiusano@lmi.org
>   Tel: 571.633.7722
> **************************************************************************
> 


-----Original Message-----
From: Maciejewski, Thomas [mailto:Thomas.Maciejewski@lehman.com]
Sent: Wednesday, September 11, 2002 10:59 AM
To: 'xml-dev@lists.xml.org'
Subject: [xml-dev] abstract types


Is there a way to enforce abstract types.  For example lets say I have an
interface : printable  

but then I have a concrete "class" wordDocument that derives from printable
with some additional information.  Lets say I would like to serialize these
objects to XML.  Lets say I also have a class queue that can have many
"printable" objects ... 

so in my xml I would like to have :

<foo>
	<wordDocument name="toms document" />
	<excelDocument name="toms spreadsheet" />
</foo>

but not allow:
<foo>
	<printable />
</foo>



we may assume that there actually is more data in these elements 

what is the best way to do this in XML?

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