I'd like to write an XML file within several small steps:

gint
main(gint argc, gchar** argv) {
        GsfXMLOut* xmlout;
        GsfOutput* out;

        gsf_init();
        out = gsf_output_stdio_new("demo.xml", NULL);
        xmlout = gsf_xml_out_new(out);

        gsf_xml_out_start_element(xmlout, "output");
        gsf_xml_out_add_cstr(xmlout, NULL, "Text 1");
        gsf_xml_out_add_cstr(xmlout, NULL, "Text 2");
        gsf_xml_out_end_element(xmlout);

        gsf_output_close(out);
        return 0;
}

This results in an xml file like this:
<?xml version="1.0" encoding="UTF-8"?>
<output>Text 1>Text 2</output>

The expected output would be something like:
<?xml version="1.0" encoding="UTF-8"?>
<output>Text 1 Text 2</output>