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A type hierarchy would use a vocabulary (schema) designed for that purpose.
Such vocabularies are not presently part of XML per se, though you can find
type-hierarchy concepts discussed in several papers, such as those at the
W3C RDF site and in a paper that I co-authored,
http://www.w3.org/TR/1998/NOTE-XML-data-0105/Overview.html.
> -----Original Message-----
> From: BAILLE-PIERRE Cécile [SMTP:cecile.baille-pierre@b...]
> Sent: Tuesday, February 10, 1998 7:28 AM
> To: Mailing Liste XML-DEV/Messages (Adresse de messagerie)
> Cc: Cécile Baille-Pierre (Adresse de messagerie)
> Subject: Object Hierarchie with XML
>
> As I'm just begin looking at XML specifications , my question will be
> perhaps a nonsense (In this case I promise this question will be the first
> and last one!).
> As far as I understand, XML document has a tree-like structure which is
> perfect to reflect composition /aggregation entities ("my book is composed
> of : a title, an author, one po more paragraphs, etc ..). where child
> elements represent parts of the element currently defined.
> But how simply implement a class hierarchy, i.e "element E is derived from
> super-Element S and inherit attributes and properties"?
>
> Cécile.
>
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