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Choice & Sequences in Extension Point [message #315454]

Thu, 10 May 2007 10:41

Aravindhan Annamalai

Messages: 89
Registered: July 2009
Location: Chennai

Member

Hi All....
we are just starting up how to create an extension point...we
wanna understand the difference between choice and sequences...in the
extension references...

we are exploring into PDE....can anyone suggest some links whr we hav
resources like...whtz the diff between plug-in dependencies and extension
points?
when to use dependencies and extension points?

thanks,Aravind

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Re: Choice & Sequences in Extension Point [message #315480 is a reply to message #315454]

Thu, 10 May 2007 12:38

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Aravind wrote:
> Hi All....
> we are just starting up how to create an extension point...we
> wanna understand the difference between choice and sequences...in the
> extension references...

That's XSD (for example http://www.w3schools.com/schema/default.asp) ...
choice means pick one of the following elements, sequence means the
following elements in order.

You can do similar things with them sometimes (playing around with min
or max values), but basically that's it.

As for the other question. I'd look at the articles available on
http://www.eclipse.org/articles/

Plugin dependencies allow you to compile against a plugin. Extension
points allow a low level core or engine plugin to be extended by a
higher level contributed plugin.

PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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