add_for_id
Description:
Appends the value associated with key_name to this.
This key_name is used to create a new ParamSpec instance, which is
further used to create and register a key using
register_metadata_key.
A property key_name consists of segments consisting of ASCII letters and digits, separated by either the '-' or '_' character. The first character of a property key_name must be a letter. Key_names which violate these rules lead to undefined behaviour.
Parameters:
| this |
data to change |
| key_name |
name of the key to change or add |
| value |
the new value |
Returns:
|
TRUE if |