diff --git a/xml/versions.rng b/xml/versions.rng
new file mode 100644
index 0000000000..87d04b143f
--- /dev/null
+++ b/xml/versions.rng
@@ -0,0 +1,24 @@
+<?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="attribute-version"/>
+  </start>
+
+  <define name="attribute-version">
+    <attribute name="validate-with">
+      <choice>
+	<value>none</value>
+	<value>pacemaker-0.6</value>
+	<value>transitional-0.6</value>
+	<value>pacemaker-0.7</value>
+	<value>pacemaker-1.0</value>
+	<value>pacemaker-1.1</value>
+	<value>pacemaker-1.2</value>
+      </choice>
+    </attribute>
+    <attribute name="admin_epoch"><data type="nonNegativeInteger"/></attribute>
+    <attribute name="epoch"><data type="nonNegativeInteger"/></attribute>
+    <attribute name="num_updates"><data type="nonNegativeInteger"/></attribute>
+  </define>
+</grammar>