The musicxml library has been completely redesigned. To summarize, it is now a generic xml parser and memory representation, with automatic typing of the musicxml elements and with an improved STL support. The resulting API is more homogeneous and adheres strictly to the musicxml dtds, but it is NOT compatible with the previous version 1.xx of the library.
The main reason of this drastic change is to update to the version 2 of the musicxml format and also to make the source code more easy to maintain.
For the moment, the new musicxml library is available from the svn repository, it is located on /libmusicxml/branches/v2
The latest version 1.10 is still available on a separate branch at /libmusicxml/branches/v1