added missing xerces dependency from latest parser changes
diff --git a/asterix-aql/pom.xml b/asterix-aql/pom.xml
index da13747..465c3b9 100644
--- a/asterix-aql/pom.xml
+++ b/asterix-aql/pom.xml
@@ -139,6 +139,11 @@
 			<version>0.0.3</version>
 			<scope>compile</scope>
 		</dependency>
+		<dependency>
+			<groupId>xerces</groupId>
+			<artifactId>xerces</artifactId>
+			<version>2.4.0</version>
+		</dependency>
 	</dependencies>
 
 </project>