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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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         This extension point is used to register an overriding Ecore factory implementation against a namespace URI (Uniform Resource Identifier) in EMF's global package registry, <samp>EPackage.Registry.INSTANCE</samp>. When the corresponding Ecore package is initialized, the package registry is consulted for the registered factory implementation to override the default that would otherwise be used.
      
   

   
      
         
            
         
      
      
         
            
         
         
            
               
                  A fully qualified identifier of the target extension point.
               
            
         
         
            
               
                  An optional identifier of the extension instance.
               
            
         
         
            
               
                  An optional name of the extension instance.
               
            
         
      
   

   
      
         
            
         
      
      
         
            
               
                  A URI that uniquely identifies an Ecore package for which this factory in an override.
               
            
         
         
            
               
                  A fully qualified name of the Java class of the overriding factory implementation.
               
               
                  
               
            
         
      
   

   
      
         
      
      
         2.2.0
      
   

   
      
         
      
      
         Following is an example of how an overriding factory implementation can be registered: 
<pre>
  <extension point="org.eclipse.emf.ecore.factory_override" >
     <factory uri="http://www.eclipse.org/xsd/2002/XSD" class="org.eclipse.xsd.impl.XSDFactoryImpl"/> 
  </extension>
</pre>
      
   

   
      
         
      
      
         The value of the class attribute must represent a factory implementation that extends <samp>org.eclipse.emf.ecore.EFactory</samp> and appropriately implements the factory interface of the package being overriden.
<p>
An EMF factory can also be registered from the source code for standalone execution with the <samp>EPackage.Registry.INSTANCE</samp> as follows:
</p>
<pre>
  EPackage.Registry.INSTANCE.put
    ("http://www.eclipse.org/xsd/2002/XSD", 
      new EPackage.Descriptor()
      {
        public EPackage getEPackage()
        {
          return null;
          // Or, if you want this to behave like a preregistered package, return the instance being overriden
          // return XSDPackage.eINSTANCE
          // Or, if there might be a descriptor in the registry already, we might fetch it first, and delegate to that.
        }

        public EFactory getEFactory()
        {
          return 
            new XSDFactoryImpl()
            {
              // overrides
            };
        }
      });
</pre>
      
   


   
      
         
      
      
         Copyright (c) 2005 IBM Corporation and others.<br>
All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at <a 
href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>