Index: TXM/trunk/org.txm.searchengine.cqp.rcp/plugin.xml
===================================================================
--- TXM/trunk/org.txm.searchengine.cqp.rcp/plugin.xml	(revision 3357)
+++ TXM/trunk/org.txm.searchengine.cqp.rcp/plugin.xml	(revision 3358)
@@ -188,8 +188,9 @@
          </command>
          <command
                commandId="org.txm.searchengine.cqp.rcp.handlers.base.Substraction"
-               label="Substract"
-               style="push">
+               label="- Substract"
+               style="push"
+               tooltip="Substract">
             <visibleWhen
                   checkEnabled="false">
                <reference
@@ -198,8 +199,8 @@
             </visibleWhen>
          </command>
          <command
-               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Intersection"
-               label="Intersect"
+               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Union"
+               label="∪ Add"
                style="push">
             <visibleWhen
                   checkEnabled="false">
@@ -209,8 +210,8 @@
             </visibleWhen>
          </command>
          <command
-               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Union"
-               label="Add"
+               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Intersection"
+               label="∩ Intersect"
                style="push">
             <visibleWhen
                   checkEnabled="false">
@@ -261,8 +262,9 @@
          </command>
          <command
                commandId="org.txm.searchengine.cqp.rcp.handlers.base.Substraction"
-               label="Substract"
-               style="push">
+               label="- Substract"
+               style="push"
+               tooltip="Substract">
             <visibleWhen
                   checkEnabled="false">
                <reference
@@ -271,8 +273,8 @@
             </visibleWhen>
          </command>
          <command
-               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Intersection"
-               label="Intersect"
+               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Union"
+               label="∪ Add"
                style="push">
             <visibleWhen
                   checkEnabled="false">
@@ -282,8 +284,8 @@
             </visibleWhen>
          </command>
          <command
-               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Union"
-               label="Add"
+               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Intersection"
+               label="∩ Intersect"
                style="push">
             <visibleWhen
                   checkEnabled="false">
@@ -335,8 +337,9 @@
             </command>
                         <command
                               commandId="org.txm.searchengine.cqp.rcp.handlers.base.Substraction"
-                              label="Substract"
-                              style="push">
+                              label="-"
+                              style="push"
+                              tooltip="Substract">
                            <visibleWhen
                                  checkEnabled="false">
                               <reference
@@ -391,6 +394,9 @@
                      value="org.txm.searchengine.cqp.corpus.MainCorpus">
                </instanceof>
             </iterate>
+            <count
+                  value="1">
+            </count>
          </with>
       </definition>
       <definition
@@ -398,12 +404,14 @@
          <with
                variable="selection">
             <iterate
-                  ifEmpty="false"
                   operator="and">
                <instanceof
                      value="org.txm.searchengine.cqp.corpus.Subcorpus">
                </instanceof>
             </iterate>
+            <count
+                  value="1">
+            </count>
          </with>
       </definition>
       <definition
@@ -417,6 +425,9 @@
                      value="org.txm.searchengine.cqp.corpus.CQPCorpus">
                </instanceof>
             </iterate>
+            <count
+                  value="1">
+            </count>
          </with>
       </definition>
    </extension>
