[xml] xmlNewProp - Creating duplicate attributes in document

[Trappel Martin <martin trappel ksengineers at>]

Hello!

Normally I'm using xmlSetProp(..) to write properties, which works.

In one instance I've used xmlNewProp(..) and it seems that this function
leads to an invalid document tree ... ?

Consider this:
--- test.xml ---
<?xml version="1.0" encoding="UTF-8"?>
<ROOT/>
---
****
xmlDocPtr doc = xmlReadFile(fname, NULL, XML_PARSE_NOBLANKS);
xmlNodePtr root_element = xmlDocGetRootElement(doc);
if(XML_ELEMENT_NODE == root_element->type) {
  xmlAttrPtr newAttr1 = xmlNewProp(root_element, XMLCHARCAST("attrname"),
XMLCHARCAST("attrvalue"));
  xmlAttrPtr newAttr2 = xmlNewProp(root_element, XMLCHARCAST("attrname"),
XMLCHARCAST("attrvalue"));
}
xmlSaveFile(fname, doc);
****
--- test.xml ---
<?xml version="1.0" encoding="UTF-8"?>
<ROOT attrname="attrvalue" attrname="attrvalue"/>
---

Is this the intended behaviour of xmlNewProp(..)? (libxml2 2.18.0)


best regards / mit freundlichen Grüßen,
Martin Trappel