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Difference between Children Feature and Containment Feature? [message #657328]

Wed, 02 March 2011 13:19

akoeck

Messages: 62
Registered: December 2010

Member

What is the difference between children feature and containment feature.

For example in a comartment. In the Child Reference I have Children Feature and Containment Feature. Which do I have tu use and why?

[Updated on: Wed, 02 March 2011 13:19]

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Re: Difference between Children Feature and Containment Feature? [message #657657 is a reply to message #657328]

Thu, 03 March 2011 15:32

Michael Golubev

Messages: 383
Registered: July 2009

Senior Member

Hello,

The answer is covered in the "Mapping Definition" section of the GMF Tutorial 2 which states:

Quote:

Note : If you're wondering about the difference between 'Children Feature' and 'Containment Feature' the idea is this (as described in the newsgroup): the 'Containment Feature' refers to where children are stored, while the 'Children Feature' refers to where to take them from. These are usually the same, and there is no need to set Children Feature if Containment Feature is set as it will default to this value. An example of when you'd need to specify this property is with EClass and EAttribute where eStructuralFeatures is the 'containment' for both operations and attributes, but where eAttributes is 'children' for instances of EAttribute.

Regards,
Michael

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