+const char * const LOAD_POLICY_NAME("loadPolicy");
+const char * const RELEASE_POLICY_NAME("releasePolicy");
+const char * const ORIENTATION_CORRECTION_NAME("orientationCorrection");
+const char * const AUXILIARY_IMAGE_NAME("auxiliaryImage");
+const char * const AUXILIARY_IMAGE_ALPHA_NAME("auxiliaryImageAlpha");
+const char * const PLAY_RANGE_NAME( "playRange" );
+const char * const PLAY_STATE_NAME( "playState" );
+const char * const CURRENT_PROGRESS_NAME( "currentProgress" );