public function writeString($string)
    {
        fwrite($this->stream, '    <si><t>' . Utils::escape($string) . '</t></si>' . MyWriter::EOL);
        return $this->id++;
    }
public function writeString($string)
    {
        fwrite($this->stream, '    <si><t>' . Utils::escape($string) . '</t></si>' . MyWriter::EOL);
        return $this->id++;
    }
public function writeString ( $ string ) { fwrite ( $ this -> stream , '    <si><t>' . Utils :: escape ( $ string ) . '</t></si>' . MyWriter :: EOL ) ; return $ this -> id ++ ; }
String MUST already be escaped
@param string $string
@return integer id referencing string
String MUST already be escaped