diff --git a/heartbeat/metadata.rng b/heartbeat/metadata.rng
index ac534db82..3dd735547 100644
--- a/heartbeat/metadata.rng
+++ b/heartbeat/metadata.rng
@@ -1,91 +1,93 @@
 <grammar xmlns="http://relaxng.org/ns/structure/1.0">
 
 <start><element name="resource-agent">
 	<attribute name="name" />
+	<optional><attribute name="version" /></optional>
+
 	<element name="version"> <text /> </element>
 	<element name="longdesc"> <attribute name="lang" /> <text /> </element>
 	<element name="shortdesc"> <attribute name="lang" /> <text /> </element>
 
 	<element name="parameters"> <oneOrMore>
 		<element name="parameter">
 			<attribute name="name" />
 			<optional>
 			<attribute name="unique"> <ref name="boolean-values" /> </attribute>
 			</optional>
 			<optional>
 				<attribute name="required"> <ref name="boolean-values" /> </attribute>
 			</optional>
 
 			<element name="longdesc">
 				<attribute name="lang" />
 				<text />
 			</element>
 
 			<element name="shortdesc">
 				<attribute name="lang" />
 				<text />
 			</element>
 
 			<element name="content">
 				<choice>
 					<attribute name="type">
 						<choice>
 							<value>boolean</value>
 							<value>string</value>
 							<value>second</value>
 							<value>integer</value>
 						</choice>
 					</attribute>
 					<group>
 						<attribute name="type">
 							<value>select</value>
 						</attribute>
 						<zeroOrMore>
 							<element name="option">
 								<attribute name="value" />
 							</element>
 						</zeroOrMore>
 					</group>
 				</choice>
 				<optional>
 					<attribute name="default"> <text /> </attribute>
 				</optional>
 			</element>
 		</element>
 	</oneOrMore> </element>
 
 	<element name="actions"> <oneOrMore>
 		<element name="action">
 			<attribute name="name" />
 			<optional>
 				<attribute name="depth" />
 			</optional>
 			<attribute name="timeout" />
 			<optional>
 				<attribute name="interval" />
 			</optional>
 			<optional>
 				<attribute name="start-delay" />
 			</optional>
 			<optional>
 				<attribute name="role"> <ref name="role-values" /> </attribute>
 			</optional>
 		</element>
 	</oneOrMore> </element>
 </element></start>
 
 <define name="boolean-values">
 	<choice>
 		<value>0</value>
 		<value>1</value>
 	</choice>
 </define>
 
 <define name="role-values">
 	<choice>
 		<value>Master</value>
 		<value>Slave</value>
 	</choice>
 </define>
 
 </grammar>