+const char * const IMAGE_BORDER( "border" );
+const char * const PIXEL_ALIGNED_UNIFORM_NAME( "uPixelAligned" );
+const char * const ANIMATED_IMAGE_URLS_NAME("urls");
+const char * const BATCH_SIZE_NAME("batchSize");
+const char * const CACHE_SIZE_NAME("cacheSize");
+const char * const FRAME_DELAY_NAME("frameDelay");
+const char * const LOOP_COUNT_NAME("loopCount");
+const char * const MASK_CONTENT_SCALE_NAME("maskContentScale");
+const char * const CROP_TO_MASK_NAME("cropToMask");
+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_FRAME_NUMBER_NAME( "currentFrameNumber" );
+const char * const TOTAL_FRAME_NUMBER_NAME( "totalFrameNumber" );
+const char * const STOP_BEHAVIOR_NAME( "stopBehavior" );
+const char * const LOOPING_MODE_NAME( "loopingMode" );