[xml] xmlParseFile alocates memory and xmlFreeDoc does not free all the memory

[Ioan Paul Pirau <ioanpaul pirau tanner de>]

Hello,

I have this sequence of code :

       xmlDocPtr doc;
       xmlNodePtr node, pNode;
       xmlChar* key;

       //check if the file is valid against it's DTD
       xmlDoValidityCheckingDefaultValue = 1;
       xmlParserCtxtPtr pctxt;
       pctxt = xmlCreateFileParserCtxt(strFileName.c_str());
       xmlParseDocument(pctxt);
       if (!pctxt->valid)
       {
           p_Result = NoBook;
           return;
       }

       doc = xmlParseFile((char*)strFileName.c_str());

       xmlFreeDoc(doc);//clear memory
       xmlCleanupParser();
       xmlMemoryDump();

... and the thing is that xmlFreeDoc does not delete all the memory 
allocated by the calls :

   xmlParseDocument(pctxt);
and
   xmlParseFile((char*)strFileName.c_str());

In my case I use a 2 Mb XML file and the memory leak is quite big ...
SO :

       xmlParseDocument(pctxt);                        //allocates 36 
kb of memory
       xmlParseFile((char*)strFileName.c_str()); //allocates 60 kb of 
memory

       xmlFreeDoc(doc);                                    //clears 20 
kb of memory
       xmlCleanupParser();                                 //doesn't 
clear any memory ( or <1kb)
       xmlMemoryDump();                                 //doesn't clear 
any memory ( or <1kb)

Any ideeas where this might come from?
I've read the rest of the postings on the memory leaks created by this 
functions .. but none were helpfull.
I mention that use the latest windows version of libxml2.

regards,
John Paul Pirau