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Expression Language
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         <p>
This extension point allows you to create reusable extensions.  They can then be used in other core expression constructs.
</p>
<p>
The reference element in a core expression will evaluated the expression definition with the evaluation context that is active for the reference element.
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                  a fully qualified identifier of the target extension point
               
            
         
         
            
               
                  an optional identifier of the extension instance
               
            
         
         
            
               
                  an optional name of the extension instance
               
               
                  
               
            
         
      
   

   
      
         
            Provides a global definition of an expression to be used with the &lt;reference/&gt; expression element.  This helps to reuse common expressions.
         
      
      
         
            
            
            
            
            
            
            
            
            
            
            
            
         
         
            
               
                  A globally unique identifier for the expression definition.
               
            
         
      
   

   
      
         
      
      
         3.3
      
   

   
      
         
      
      
         You can define and the use core expressions:

<p>
<pre>
<extension point="org.eclipse.core.expressions.definitions">
   <definition id="com.example.parts.activeProblemsView">
       <with variable="activePartId">
          <equals value="org.eclipse.ui.views.ProblemsView"/>
       </with>
   </definition>
   <definition id="com.example.markers.markerSelection">
       <iterate>
          <instanceof value="org.eclipse.core.resources.IMarker"/>
       </with>
   </definition>
</extension>
</pre>
</p>
<p>
Then this expression definition can be used when composing other expressions.
</p>
<p>
<pre>
<enabledWhen>
   <reference definitionId="com.example.parts.activeProblemsView">
</enabledWhen>
</pre>
<pre>
<visibleWhen>
   <and>
      <reference definitionId="com.example.parts.activeProblemsView"/>
      <reference definitionId="com.example.markers.markerSelection"/>
   </and>
</visibleWhen>
</pre>
</p>
      
   



   
      
         
      
      
         Copyright (c) 2007, 2008 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>