SWS-544 - Added XPath validation javadoc

Author: poutsma

test/src/main/java/org/springframework/ws/mock/client/XPathExpectations.java

@@ -17,11 +17,16 @@
 package org.springframework.ws.mock.client;
 
 /**
- * Allows for setting up expectations on XPath expressions. Implementations of this interface are returned by {@link
- * WebServiceMock}.
+ * Allows for setting up expectations on XPath expressions.
+ * <p/>
+ * Implementations of this interface are returned by {@link WebServiceMock#xpath(String)} and {@link
+ * WebServiceMock#xpath(String, java.util.Map)}, as part of the fluent API. As such, it is not typical to implement this
+ * interface yourself.
  *
  * @author Lukas Krecan
  * @author Arjen Poutsma
+ * @see WebServiceMock#xpath(String)
+ * @see WebServiceMock#xpath(String, java.util.Map)
  * @since 2.0
  */
 public interface XPathExpectations {