comparison tests/expected/transforms-summaries-percussiononsets-from-rdf.n3 @ 19:bd1deebe1129

* Set track metadata only if non-empty (the RDF feature writer tests for
  existence rather than non-emptiness when determining whether to write
  a track)

     vamp:plugin <http://vamp-plugins.org/rdf/plugins/vamp-example-plugins#percussiononsets> ;
     vamp:sample_rate "44100"^^xsd:float ;
     vamp:step_size "512"^^xsd:int ;
     a vamp:Transform .
 
+    mo:encodes :signal_1 ;
     a mo:AudioFile .
 
 :signal_1
     mo:time [
         tl:onTimeLine :signal_timeline_1 ;
         a tl:Interval
     ] ;
     a mo:Signal .
+
+:signal_timeline_1
+    a tl:Timeline .
 
 :event_2
     event:time [
         tl:at "PT0.777868480S"^^xsd:duration ;
         tl:onTimeLine :signal_timeline_1 ;