Validate changes.xml file
diff --git a/pom.xml b/pom.xml
index 3f20c66..3966443 100644
--- a/pom.xml
+++ b/pom.xml
@@ -97,6 +97,23 @@
 					</execution>

 				</executions>

 			</plugin>

+			<plugin>

+				<groupId>org.apache.maven.plugins</groupId>

+				<artifactId>maven-changes-plugin</artifactId>

+				<version>2.1</version>

+				<executions>

+					<execution>

+						<id>validate-changes</id>

+						<phase>pre-site</phase>

+						<goals>

+							<goal>changes-validate</goal>

+						</goals>

+						<configuration>

+							<failOnError>true</failOnError>

+						</configuration>

+					</execution>

+				</executions>

+			</plugin>

 		</plugins>

 	</build>

 	<reporting>

diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 78205b9..9443bda 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -1,10 +1,15 @@
-<document>

+<document xmlns="http://maven.apache.org/changes/1.0.0"

+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

+    xsi:schemaLocation="http://maven.apache.org/changes/1.0.0 http://maven.apache.org/plugins/maven-changes-plugin/xsd/changes-1.0.0.xsd">

 	<properties>

 		<title>YAML 1.1 parser and emitter</title>

 		<author email="py4fun@gmail.com">Andrey Somov</author>

 	</properties>

 	<body>

 		<release version="1.2-SNAPSHOT" date="in Mercurial" description="development">

+            <action dev="py4fun" type="update">

+                Validate changes.xml file (2009-05-25)

+            </action>

             <action dev="py4fun" type="fix" due-to="Magne" issue="40">

                 Fix: getting an error when javabean contains java.sql.Timestamp fields (2009-05-25)

             </action>