This extension point allows a plug-in to register compare/merge
viewers for structural content types. The viewer is expected to
extend <samp>org.eclipse.jface.viewers.Viewer</samp>.
However, since viewers don't have a default constructor,
the extension point must implement the factory interface
for viewers <samp>org.eclipse.compare.IViewerCreator</samp>.
a unique identifier that can be used to reference the viewer
name of a class that implements <samp>org.eclipse.compare.IViewerCreator</samp>
a comma separated list of file extensions e.g. "zip, jar"
The following is an example of compare/merge viewer
for zip files (extension "zip"):
<p>
<pre>
<extension point = "org.eclipse.compare.structureMergeViewers">
<viewer
id="org.eclipse.compare.ZipCompareViewer"
class="org.eclipse.compare.ZipCompareViewerCreator"
extensions="zip"
/>
</extension>
</pre>
</p>
The Compare UI plugin defines a structure compare
viewer for zip archives.
<p>
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</p>