From http://www.w3schools.com (Copyright Refsnes Data)

You Have Learned XQuery, Now What?

XQuery Summary

This tutorial has taught you how to query XML data.

You have learned that XQuery was designed to query anything that can appear as XML, including databases.

You have also learned how to query the XML data with FLWOR expressions, and how to construct XHTML output from the collected data.

For more information on XQuery, please look at our XQuery Reference.

The next step is to learn about XLink and XPointer.

XLink and XPointer

Linking in XML is divided into two parts: XLink and XPointer.

XLink and XPointer define a standard way of creating hyperlinks in XML documents.

If you want to learn more about XLink and XPointer, please visit our XLink and XPointer tutorial.