+const char* const PROPERTY_TEXT = "text";
+const char* const PROPERTY_MULTILINE_POLICY = "multiline-policy";
+const char* const PROPERTY_WIDTH_EXCEED_POLICY = "width-exceed-policy";
+const char* const PROPERTY_HEIGHT_EXCEED_POLICY = "height-exceed-policy";
+const char* const PROPERTY_LINE_JUSTIFICATION = "line-justification";
+const char* const PROPERTY_FADE_BOUNDARY_LEFT = "fade-boundary-left";
+const char* const PROPERTY_FADE_BOUNDARY_RIGHT = "fade-boundary-right";
+const char* const PROPERTY_FADE_BOUNDARY_TOP = "fade-boundary-top";
+const char* const PROPERTY_FADE_BOUNDARY_BOTTOM = "fade-boundary-bottom";
+const char* const PROPERTY_LINE_HEIGHT_OFFSET = "line-height-offset";
+const char* const PROPERTY_HORIZONTAL_ALIGNMENT = "horizontal-alignment";
+const char* const PROPERTY_VERTICAL_ALIGNMENT = "vertical-alignment";
+