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    { "id" : "http://dbpedia.org/resource/Plane_wave"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "In the physics of wave propagation, a plane wave (also spelled planewave) is a constant-frequency wave whose wavefronts (surfaces of constant phase) are infinite parallel planes of constant peak-to-peak amplitude normal to the phase velocity vector.It is not possible in practice to have a true plane wave; only a plane wave of infinite extent will propagate as a plane wave.  However, many waves are approximately plane waves in a localized region of space." ] ,
        "http://xmlns.com/foaf/0.1/depiction" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Plane_wave_wavefronts_3D.svg" ] ,
        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Plane_wave_wavefronts_3D.svg?width=300"] } } }
