updated  getVisitorClass() to latest api
diff --git a/src/main/java/net/sf/taverna/t2/activities/xpath/XPathActivityHealthCheck.java b/src/main/java/net/sf/taverna/t2/activities/xpath/XPathActivityHealthCheck.java
index ade6809..adf10d2 100644
--- a/src/main/java/net/sf/taverna/t2/activities/xpath/XPathActivityHealthCheck.java
+++ b/src/main/java/net/sf/taverna/t2/activities/xpath/XPathActivityHealthCheck.java
@@ -24,7 +24,7 @@
 	public static final int MISSING_NAMESPACE_MAPPINGS = 25;

 

 	@Override

-	public Class<? extends Visitor> getVisitorClass() {

+	public Class<? extends Visitor<?>> getVisitorClass() {

 		return XPathActivityHealthChecker.class;

 	}