* Get data from the file level data block of an edje file
* @param file The path to the .edj file
* @param key The data key
- * @return The string value of the data
+ * @return The string value of the data. Must be freed by the user when no
+ * longer needed.
*
* If an edje file is built from the following edc:
*
*
* @param obj A handle to an Edje object
* @param key The data field's key string
- * @return The data's value string
+ * @return The data's value string. Must not be freed.
*
* This function fetches an EDC data field's value, which is declared
* on the objects building EDC file, <b>under its group</b>. EDC data