From Sons of Thunder Software:
The XML Library provides an all-Transcript plugin for Revolution developers. Allows manipulation of multiple XML documents at once. The Standard version is inexpensive and provides for the creation and manipulation of XML documents; additionally it is unlocked so you can modify the routines to suit your preference or to add specialized code. Full documentation is included.
If all you need to do is read XML documents, see the entry for XML Library (Basic), which is free.