[xml] Duplicate PI nodes issue


I have the following program below, when it runs it produces the follwing ouput
<?xml version="1.0"?>
<?xml version="1.0" encoding="UTF-8"?>

Is this a bug?
How can I work around the issue, assuming I have to support differ libxml version?

Please assume that the xml and content parameters are dynamic strings.

Best Regards
Alistair Leslie-Hughes

#include <string.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>

int main(int argc, char* argv[])
   xmlDoc *doc = NULL;
   xmlNodePtr nodePI = NULL;


   doc = xmlNewDoc( xmlCharStrdup("1.0") );
nodePI = xmlNewPI( xmlCharStrdup("xml"), xmlCharStrdup("version=\"1.0\" encoding=\"UTF-8\""));
   xmlAddChild( (xmlNodePtr)doc, nodePI);

   xmlSaveFile("zzzzzz.xml", doc);

   return 0;

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