private function getValue($tag_name) {
		return is_null($this->tag) ? $this->empty : $this->tag->getChildValue($tag_name);
	}
private function getValue($tag_name) {
		return is_null($this->tag) ? $this->empty : $this->tag->getChildValue($tag_name);
	}
private function getValue ( $ tag_name ) { return is_null ( $ this -> tag ) ? $ this -> empty : $ this -> tag -> getChildValue ( $ tag_name ) ; }
Fetch the character data contained in some element.
This function is for internal usage only.
@param string the name of the tag whose value is needed
@retval string the value or NULL if the value is absent
Fetch the character data contained in some element . This function is for internal usage only .