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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 :
<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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