External data is specified in the plugin info file prefixed with X-. For
example, if a key/value pair X-Peas=1 is specified in the key file, you
can use "Peas" for @key to retrieve the value "1".
Note: that you can omit the X- prefix when retrieving the value,
but not when specifying the value in the file.
Gets external data specified for the plugin.
External data is specified in the plugin info file prefixed with X-. For example, if a key/value pair X-Peas=1 is specified in the key file, you can use "Peas" for @key to retrieve the value "1".
Note: that you can omit the X- prefix when retrieving the value, but not when specifying the value in the file.