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Eclipse Plug-in Developer Guide
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Content Viewers


This extension point allows a plug-in to register viewers for specific content types. These viewers are used in the EditionSelectionDialog when presenting an edition of a resource or a subsection thereof. The viewer is expected to extend org.eclipse.jface.viewers.Viewer. However since viewers don't have a default constructor the extension point must implement the factory interface for viewers

Configuration Markup:

<!ELEMENT extension ( viewer* , contentTypeBinding*)>

<!ATTLIST extension





  • point - a fully qualified identifier of the target extension point
  • id - an optional identifier of the extension instance
  • name - an optional name of the extension instance


<!ATTLIST viewer

id         CDATA #REQUIRED

class      CDATA #REQUIRED

extensions CDATA #IMPLIED


  • id - a unique identifier that can be used to reference the viewer
  • class - a fully qualified name of a class that implements a factory for the content viewer and implements
  • extensions - a comma separated list of file extensions e.g. "java, gif"

<!ELEMENT contentTypeBinding EMPTY>

<!ATTLIST contentTypeBinding

contentTypeId   IDREF #REQUIRED

contentViewerId IDREF #REQUIRED


A contentTypeBinding binds a content viewer to a content type.

  • contentTypeId - The id of a content type defined using the org.eclipse.core.contenttype.contentTypes extension point.
  • contentViewerId - The id of a content viewer defined using the viewer element of this extension point (i.e.

The following is an example of a viewer for text files (extension "txt"):

<extension point = 

Supplied Implementation:
The Compare UI plugin defines content viewers for text and images.

Copyright (c) 2000, 2008 IBM Corporation and others.
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

  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire