def simple_value(self, elt, ps, mixed=False):
if not _valid_encoding(elt):<EOL><INDENT>raise EvaluateException('<STR_LIT>', ps.Backtrace(elt))<EOL><DEDENT>c = _children(elt)<EOL>if mixed is False:<EOL><INDENT>if len(c) == <NUM_LIT:0>:<EOL><INDENT>raise EvaluateException('<STR_LIT>', ps.Backtrace(elt))<EOL><DEDENT>for c_elt in c:<EOL><INDENT>if c_elt.nodeType == _Node.ELEMENT_NODE:<EOL><INDENT>raise EvaluateException('<STR_LIT>',<EOL>ps.Backtrace(c_elt))<EOL><DEDENT><DEDENT><DEDENT>return '<STR_LIT>'.join([E.nodeValue for E in c<EOL>if E.nodeType <EOL>in [ _Node.TEXT_NODE, _Node.CDATA_SECTION_NODE ]])<EOL>
Get the value of the simple content of this element.
        Parameters:
            elt -- the DOM element being parsed
            ps -- the ParsedSoap object.
            mixed -- ignore element content, optional text node