Expat XML Processor is a Scripts software developed by Karl Waclawek. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Expat XML Processor:

Edit by Marydown: This is an interface to James Clark's Expat Library for parsing XML documents. Module Processor.ozf exports a class that implements a SAX-like processor which can be used e.g. as shown below. SAX events are invoked as methods. Each application should specialize these methods to do something useful.