expat is a C library for parsing XML written by James Clark. Expat is a stream-oriented XML parser. This means that you register handlers with the parser before starting the parse. These handlers are called when the parser discovers the associated structures in the document being parsed. A start tag is an example of the kind of structures for which you may register handlers. The msys-expat package provides the xmlwf validation tool and documentation related to the library. The associated msys-libexpat package provides the runtime library and related development files. expat is a C library for parsing XML written by James Clark. Expat is a stream-oriented XML parser. This means that you register handlers with the parser before starting the parse. These handlers are called when the parser discovers the associated structures in the document being parsed. A start tag is an example of the kind of structures for which you may register handlers. The msys-libexpat package provides the runtime library and related development files for expat. The associated msys-expat package provides the xmlwf validation tool and documentation related to the library.