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abstract types

• To: "'xml-dev@l...'" <xml-dev@l...>
• Subject: abstract types
• From: "Maciejewski, Thomas" <Thomas.Maciejewski@l...>
• Date: Wed, 11 Sep 2002 10:59:26 -0400

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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