Here is a list of all documented files with brief descriptions:

[detail level 12]

include
xcm.h	Core XCM API
xcm_addr.h	API for parsing and building XCM addresses
xcm_attr.h	XCM socket attribute access API
xcm_attr_map.h	XCM attribute map API
xcm_attr_types.h	XCM attribute value type definitions
xcm_compat.h	Obsolete parts of the XCM API
xcm_version.h	Functions and macros to retrieve XCM versioning information