EDIT

            <element ref="cdmViewer" minOccurs="0" maxOccurs="unbounded"/>

            <element ref="viewCommandMapping" minOccurs="0" maxOccurs="unbounded"/>

   <element name="viewCommandMapping">

      <annotation>

         <documentation>

            Maps a viewing class, like editors or views, to a command which opens it.

         </documentation>

      </annotation>

      <complexType>

         <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">

            <annotation>

               <documentation>

                  The name of the viewer which shows the selected element

               </documentation>

            </annotation>

         </attribute>

         <attribute name="selection" type="string" use="required">

            <annotation>

               <documentation>

                  The class of the selected element

               </documentation>

               <appInfo>

                  <meta.attribute kind="java"/>

               </appInfo>

            </annotation>

         </attribute>

      </complexType>

   </element>