+ <attribute name="commandId" type="string" use="required">
+ <annotation>
+ <documentation>
+ The command which opens the viewer to show the selected object
+ </documentation>
+ <appInfo>
+ <meta.attribute kind="identifier" basedOn="org.eclipse.ui.commands/command/@id"/>
+ </appInfo>
+ </annotation>
+ </attribute>
+ <attribute name="viewerName" type="string">