Question about memory problem

I have an app which used gdome and I have problem of memory. I know that 
the problem come from the use of GdomeDocument. I have tracked the 
memory with valgrind.
the code is :
-----------------------------------
/* Get a DOMImplementation reference */
domimpl = gdome_di_mkref ();

/* Load a new document from a file */
doc = gdome_di_createDocFromURI(domimpl, "toto.xml", GDOME_LOAD_PARSING, 
&exc);
gdome_di_unref (domimpl, &exc);
gdome_doc_unref (doc, &exc);
-----------------------------------

I still have memory that I can't freed. I know that the problem had ever 
being treated but I can't find it in the archives.
Thank you for your help,

Sylvain Cetre