Test out the form:
1. For the XML Source use: "http://www.w3schools.com/xsl/cdcatalog.xml"
2. Hit the "Load Xml Document" button
3. Now use the XPath Expression: "/catalog/cd[title='Hide your heart']"
4. Hit the "Query" button.
5. You will notice that the expression resulted in the single node, which is outputted into the last TextBox on the form.
6. Test out different XPath Expressions.