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meta-meta model confusion

Brim Fraud
Greenhorn

Joined: Aug 08, 2003
Posts: 1
I've been trying to undestand the 'theory' behind UML but have become unstuck at the meta-meta model concept. I understand where the model and meta-model come into the picture but the meta-meta model just looks like a copy of the meta-model with the word meta in front of the meta-model syntax.

So far I'm understanding the concept with this programming analogy.
---------------
Model: Source code for program
Meta-model: Syntax of language [for(a = 1 to 100)]
Meta-Meta model: syntax of syntax
[{for}{bracket}{statement}{bracket}]
----------------
But here the meta and meta meta are basically the same?
Has anyone got an intuitive explanation of the difference between meta and meta meta models
Hope this wasnt too confusing,
Thanks for any help.
Brim
[ August 08, 2003: Message edited by: Brim Fraud ]
Ilja Preuss
author
Sheriff

Joined: Jul 11, 2001
Posts: 14112
The meta-meta model is the meta model for the meta model. That is, if the meta model describes a specific language, the meta-meta model describes a language with which you can describe a language - also a different one.
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The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
 
It is sorta covered in the JavaRanch Style Guide.
 
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