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| <h1 id="ProvidingaCustomPermissionAuthority">Providing a Custom Permission Authority</h1> |
| <p>Both read and write operations on the model are executed through an accessibility layer called the model accessor, implemented by |
| <code>org.eclipse.sirius.ecore.extender.business.api.accessor.ModelAccessor</code>. Each session has an an associated |
| <code>ModelAccessor</code> which can be obtained with |
| <code>Session.getModelAccessor()</code>. |
| </p> |
| <p>The model accessor itself delegates the permission checking to an |
| <code>IPermissionAuthority</code> , which is responsible for checking which operations are permitted on a given model element. The permission authority is also used to lock model elements (both representation and semantic elements), query their lock status and be notified (through |
| <code>IAuthorityListener</code>) when a lock is taken or released. |
| </p> |
| <p>You can provide a custom permission authority by implementing the interface |
| <code>org.eclipse.sirius.ecore.extender.business.api.permission.IPermissionAuthority</code> and registering your custom implementation with the |
| <code>org.eclipse.sirius.ecore.extender.PermissionProvider</code> extension point. |
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