Aziza,

you would use owl:imports (via the Imports View) to use (e.g. instantiate) 
classes and other resources from other files. If you have the financial 
ontology in your workspace, just drag it from the Navigator into the Imports 
view. If it's online, use the Add import from URL button in the Imports View.

You definitely should not duplicate definitions from external classes. But if 
you want to use only a sub-set of another vocabulary, you could have a look at 
partial import services such as http://rdfex.org

Holger


On Apr 16, 2010, at 4:57 PM, aziza wrote:

> hello,everyone!
> I have a question how to use some concepts like classes from another
> ontology in my own ontology.
> If let's say I create my own ontology and want to use some classes
> from well defined ontology (for ex. Finance ontology). How could I do
> it?
> If you suggest me to refer them via their namespace like for ex.
> Finance:FinancialInstrument and  align them with my own classes (like
> i put below,here Model, Process, Contract classes defined by myself,
> and Finance:FinancialInstrument which is from Finance ontology where
> Finance: - is a namespace defined in Finance ontology) , wouldn't it
> be redefining classes again in my ontology and did I use
> FinancialInstrument properly?
> Thanks.
> Aziza .
> 
> Example
> 
> owl:Thing
>      Model
>      Process
>      Finance:Finaciallnstrument
>      Contract
> 
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