What xmlCleanup* functions are supposed to do ?

Hi,

It seems to me that (with 2.6.0, at least, not tested with any other version), 
using xmlCleanupGlobals() or xmlCleanupParser() does absolutely nothing.

Valgrind still tells me there is 419 bytes in 16 blocks not freed... Which I 
guess is the memory taken by the global variables...

Am I using the wrong functions or do I assume them to do something they are 
not supposed to do ?

Mike