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RE: Meta-Meta-Meta....

• To: "'Ramkumar Menon'" <ram.menon@o...>,<xml-dev@l...>
• Subject: RE: Meta-Meta-Meta....
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Tue, 25 May 2004 10:58:12 +0100
• In-reply-to: <40B2FF84.9030300@o...>
• Thread-index: AcRCL9geTqftDuz7Qvm+NIKJrFbK4gADfrvg

The usual solution to this problem is that when you get to a certain level,
the metadata describes itself. So although you can keep going up another
level, for some level N you find that metadata(N) = data(N), so you don't
find anything new by going higher.

In the data dictionary / IRDS world, four layers were generally considered
sufficient. Level 1 contains the objects appearing in the data (Fred), level
2 the objects defined in a user-written schema (Employee), level 3 the
objects defined in the data model (Table, Column, Element, Attribute), and
level 4 the language for describing data models, which is also capable of
describing itself.

Michael Kay 

> -----Original Message-----
> From: Ramkumar Menon [mailto:ram.menon@o...] 
> Sent: 25 May 2004 08:11
> To: xml-dev@l...
> Subject:  Meta-Meta-Meta....
> 
> At what level do we put a peiod on the level of abstractions 
> we have on 
> information ? We have Metadata, metada-metadata........
> Especially, in the XML World, there is an XML that represents 
> Information, XSD that is the metadata fo the information,
> Ontologies that are the metadata for the semantics of the 
> information, 
> and so on..... Where is the Sky ?
> Maybe there is a metadata for the kind of relationships that are 
> possible within an Ontology .... and so on......
> 
> -Menon
> 
> 
> 
> 
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• References:
  • Meta-Meta-Meta....
    • From: Ramkumar Menon <ram.menon@o...>

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