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         The workspace supports the notion of markers on arbitrary
resources.  A marker is a kind of metadata 
(similar to properties) which can be used to 
tag resources with user information.  Markers are 
optionally persisted by the workspace whenever a 
workspace save or snapshot is done. 
<p>
Users can define and query for markers of a given type.  
Marker types are defined in a hierarchy that supports 
multiple-inheritance.  Marker type definitions also 
specify a number attributes which must or may be 
present on a marker of that type as well as whether 
or not markers of that type should be persisted. 
<p>
The markers extension-point allows marker writers to 
register their marker types under a symbolic name that 
is then used from within the workspace to create and 
query markers. The symbolic name is the id of the 
marker extension. When defining a marker extension, 
users are encouraged to include a human-readable value 
for the "name" attribute which indentifies their marker 
and potentially may be presented to users.
      
   

   
      
         
            
            
            
         
         
            
               
                  a fully qualified identifier of the target extension point
               
            
         
         
            
               
                  a required identifier of the extension instance
               
            
         
         
            
               
                  an optional name of the extension instance
               
               
                  
               
            
         
      
   

   
      
         
            
               
                  the fully-qualified id of a marker super type (i.e., a marker type defined by another marker extension)
               
               
                  
               
            
         
      
   

   
      
         
            
               
                  "<tt>true</tt>" or "<tt>false</tt>" indicating whether or not markers of this type
should be persisted by the workspace.  If the persistent characteristic
is not specified, the marker type is <b>not</b> persisted.
               
            
         
      
   

   
      
         
            
               
                  the name of an attribute which may be present on markers of this type
               
            
         
      
   

   
      
         
      
      
         Following is an example of a marker configuration: 

<p>
<pre>
   <extension id="com.xyz.coolMarker" point="org.eclipse.core.resources.markers" name="Cool Marker"> 
      <persistent value="true"/> 
      <super type="org.eclipse.core.resources.problemmarker"/> 
      <super type="org.eclipse.core.resources.textmarker"/> 
      <attribute name="owner"/> 
   </extension> 
</pre>
</p>
      
   

   
      
         
      
      
         All markers, regardless of their type, are instances of 
<samp>org.eclipse.core.resources.IMarker</samp>.
      
   



   
      
         
      
      
         The platform itself has a number of pre-defined 
marker types. Particular product installs may 
include additional markers as required.
      
   

   
      
         
      
      
         Copyright (c) 2002, 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>