code: public Iterable<Node> selectNodes(String xPath, Source s) {
          try {
              return new IterableNodeList(
                  (NodeList) xpath.evaluate(xPath, Convert.toInputSource(s),
                                            XPathConstants.NODESET)
                                          );
          } catch (XPathExpressionException ex) {
              throw new XMLUnitException(ex);
          }
      }
docs: {@inheritDoc}