#include <...>
...
#include <xml.h>

int main(int argc,char * argv[]) 
{
    xml doc;
    /* parse from file */
    doc.parse_file(your_xml_path);
    /* parse from string */
    doc.parse(xml_string);

    *after finish the parse, we can get the nodes or attribute message like fellows:

       
    /** get the declaration of xml :
    * <?xml ... ?>
    **/
    node header = doc.header();
    string version = header["version"];
    printf("version:%s\n", version.c_str());

    but not :
    printf(doc.header()["version"]);
    return 0;
}