Workflow (server-side) groups support

- assignment of groups to pooled tasks
- retrieve group members added to javascript

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4805 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

config/alfresco/model/bpmModel.xml

@@ -12,6 +12,8 @@
         <import uri="http://www.alfresco.org/model/dictionary/1.0" prefix="d" />
         <!-- Import Alfresco Content Domain Model Definitions -->
         <import uri="http://www.alfresco.org/model/content/1.0" prefix="cm" />
+        <!-- Import User Model Definitions -->
+        <import uri="http://www.alfresco.org/model/user/1.0" prefix="usr"/>
     </imports>
 
     <namespaces>
@@ -310,6 +312,29 @@
             </associations>
         </aspect>
 
+        <!--                          -->
+        <!--  Single Group Assignee   -->
+        <!--                          -->
+
+        <aspect name="bpm:groupAssignee">
+            <associations>
+
+                <association name="bpm:groupAssignee">
+                    <source>
+                        <mandatory>false</mandatory>
+                        <many>false</many>
+                    </source>
+                    <target>
+                        <!-- TODO: Refactor when group is pulled into content model -->
+                        <class>usr:authorityContainer</class>
+                        <mandatory>true</mandatory>
+                        <many>false</many>
+                    </target>
+                </association>
+
+            </associations>
+        </aspect>
+
         <!--                                                             -->
         <!--  A collection of content routed through a workflow.         -->
         <!--                                                             -->