Parameters for this widget are passed in the config.ttl for each vocabulary - the example shows an instance of this widget with local name :messageWidgetconfigured for a vocabulary with local name :vocab:

@prefix schema:  .
@prefix skosmos:  .
@prefix : <#> .

:vocab skosmos:useParamPlugin :messageWidget .

:messageWidget  a skosmos:ParameterizedPlugin ;
                skosmos:usePlugin "message";
                skosmos:parameters [
                  a schema:PropertyValue ;
                  schema:propertyID "msg";
                  schema:value "Tämä on testiviesti."@fi , "Det här är ett testmeddelande."@sv, "This is a default test message without a language code." ;
                ] .

The message strings are identified as schema:value literals for a schema:PropertyValue with schema:propertyID "msg". The widget matches the message language with Skosmos UI language, or uses the default message with no language tag for UI languages with don't have their own designated message. The requirement for plugin is to be installed under SKOSMOS_HOME/plugins/message/ . General documentation for Skosmos plugins can be found in https://github.com/NatLibFi/Skosmos/wiki/Plugins .