diff --git a/xml/resources.rng b/xml/resources.rng
index 97e6c48074..72fbf32e04 100644
--- a/xml/resources.rng
+++ b/xml/resources.rng
@@ -1,141 +1,143 @@
 <?xml version="1.0" encoding="utf-8"?>
 <grammar xmlns="http://relaxng.org/ns/structure/1.0" 
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
   <start>
       <ref name="element-resources"/>
   </start>
 
   <define name="element-resources">
       <zeroOrMore>
 	<choice>
 	  <ref name="element-primitive"/>
 	  <ref name="element-group"/>
 	  <ref name="element-clone"/>
 	  <ref name="element-master"/>
 	</choice>
       </zeroOrMore>
   </define>
 
   <define name="element-primitive">
     <element name="primitive">
       <attribute name="id"><data type="ID"/></attribute>
       <choice>
 	<group>
 	  <attribute name="class"><value>ocf</value></attribute>
 	  <attribute name="provider"><text/></attribute>
 	</group>
 	<attribute name="class">
 	  <choice>
 	    <value>lsb</value>
 	    <value>heartbeat</value>
 	    <value>stonith</value>
 	  </choice>
 	</attribute>
       </choice>
       <attribute name="type"><text/></attribute>
       <optional>
 	<attribute name="description"><text/></attribute>
       </optional>
       <interleave>
 	<ref name="element-resource-extra"/>
 	<ref name="element-operations"/>
       </interleave>
     </element>
   </define>
 
   <define name="element-group">
     <element name="group">
       <attribute name="id"><data type="ID"/></attribute>
-      <attribute name="description"><text/></attribute>
+      <optional>
+	<attribute name="description"><text/></attribute>
+      </optional>
       <interleave>
 	<ref name="element-resource-extra"/>
 	<oneOrMore>
 	  <ref name="element-primitive"/>
 	</oneOrMore>
       </interleave>
     </element>
   </define>
  
   <define name="element-clone">
     <element name="clone">
       <attribute name="id"><data type="ID"/></attribute>
       <attribute name="description"><text/></attribute>
       <interleave>
 	<ref name="element-resource-extra"/>
 	<choice>
 	  <ref name="element-primitive"/>
 	  <ref name="element-group"/>
 	</choice>
       </interleave>
     </element>
   </define>
 
   <define name="element-master">
     <element name="master">
       <attribute name="id"><data type="ID"/></attribute>
       <attribute name="description"><text/></attribute>
       <interleave>
 	<ref name="element-resource-extra"/>
 	<choice>
 	  <ref name="element-primitive"/>
 	  <ref name="element-group"/>
 	</choice>
       </interleave>
     </element>
   </define>
 
   <define name="element-resource-extra">
     <optional>
       <element name="meta_attributes">
 	<externalRef href="nvset.rng"/>
       </element>
     </optional>
     <optional>
       <element name="instance_attributes">
 	<externalRef href="nvset.rng"/>
       </element>
     </optional>
   </define>
  
   <define name="element-operations">
     <optional>
       <element name="operations">
 	<zeroOrMore>
 	  <element name="op">
 	    <attribute name="id"><data type="ID"/></attribute>
 	    <attribute name="description"><text/></attribute>
 	    <attribute name="name"><text/></attribute>
 	    <attribute name="interval"><data type="integer"/></attribute>
 	    <attribute name="timeout"><data type="integer"/></attribute>
 	    <attribute name="enabled"><data type="boolean"/></attribute>
 	    <attribute name="role">
 	      <choice>
 		<value>Started</value>
 		<value>Slave</value>
 		<value>Master</value>
 	      </choice>
 	    </attribute>
 	    <attribute name="requires">
 	      <choice>
 		<value>nothing</value>
 		<value>quorum</value>
 		<value>fencing</value>
 	      </choice>
 	    </attribute>
 	    <attribute name="on-fail">
 	      <choice>
 		<value>ignore</value>
 		<value>block</value>
 		<value>stop</value>
 		<value>restart</value>
 		<value>fence</value>
 	      </choice>
 	    </attribute>
 	    <ref name="element-resource-extra"/>
 	  </element>
 	</zeroOrMore>
       </element>
     </optional>
   </define>
 
 </grammar>