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   abstract types

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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 :

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

but not allow:
	<printable />

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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