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extending Xpand models [message #516283]

Tue, 23 February 2010 13:50

MaximeLecourt

Messages: 108
Registered: February 2010
Location: France

Senior Member

I'm currently trying to see what it is possible to do using Xpand + MWE + Xtext (and ecore), and if I can use it for my intership.

So I've got a question, as I can't find exactly what is possible and what is not Very Happy

My point is to create databases, creating first a generic metamodel for a database, and using a more specific model for each database I'll have to create.
I want to generate API for those specific models automaticly, in any langage (providing I have the needed template, of course).
So there are my questions :

Can a model refer to another model, extending it ?
Can I do recursive extending, having a model refer to a model that refers to a model and so on ?

Can i redefine types ?
As in a "age" type, on which I define constraints (obviously an non-negative int).
Can I than use it as a simple type to classes, as we usually use int, string, bool ?

One day I shall master M2T, but that day has yet to come...

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Re: extending Xpand models [message #516487 is a reply to message #516283]

Wed, 24 February 2010 08:31

Darius Jockel

Messages: 63
Registered: July 2009

Member

Hello!

MaximeLecourt wrote on Tue, 23 February 2010 08:50

Can a model refer to another model, extending it ?
Can I do recursive extending, having a model refer to a model that refers to a model and so on ?

Ecore is a framework to define metamodels and models providing the features you mentioned. You can use multiple inheritance. You can also
partionate your model in different files.

Quote:

Can i redefine types ?
As in a "age" type, on which I define constraints (obviously an non-negative int).
Can I than use it as a simple type to classes, as we usually use int, string, bool ?

What do you mean by redifine. It is possible to subclass existing (maybe abstract) types. If the subtyp also inherit from a 'simple type' you can use it like other simple types in your model.

Regards
Darius

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