Loads the builtin function specifications from the builtin.xml file.

    :arg parser: the DocParser instance for parsing the XML tags.

def _load_builtin_xml(xmlpath, parser):
    """Loads the builtin function specifications from the builtin.xml file.

    :arg parser: the DocParser instance for parsing the XML tags.
    """
    #First we need to get hold of the fortpy directory so we can locate
    #the isense/builtin.xml file.
    result = {}

    el = ET.parse(xmlpath).getroot()
    if el.tag == "builtin":
        for child in el:
            anexec = _parse_xml(child, parser)
            result[anexec.name.lower()] = anexec

    return result