[Java] Fix lookup of types ancestor for PR aeron-io#904.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/xml/XmlSchemaParser.java

@@ -327,15 +327,26 @@ public static String getAttributeValue(final Node elementNode, final String attr
  }
 
  /**
- * To be used with child elements of {@code <types>} elements. Returns the package attribute as
- * defined on the parent {@code <types>} element
+ * To be used with descendant elements of {@code <types>} elements. Returns the package attribute value as
+ * defined on the ancestor {@code <types>} element.
  *
- * @param elementNode the node inside the types element
- * @return the package name, or null if not defined
+ * @param elementNode the node inside the {@code <types>} element.
+ * @return the package name, or null if not defined.
  */
  public static String getTypesPackageAttribute(final Node elementNode)
  {
- return getAttributeValue(elementNode.getParentNode(), "package", null);
+ Node parentNode = elementNode.getParentNode();
+ while (null != parentNode)
+ {
+ if ("types".equals(parentNode.getLocalName()) || "types".equals(parentNode.getNodeName()))
+ {
+ return getAttributeValue(parentNode, "package", null);
+ }
+
+ parentNode = parentNode.getParentNode();
+ }
+
+ return null;
  }
 
  /**