-const char * const UNIT_USER_SPACE("userSpace");
-const char * const UNIT_BOUNDING_BOX("objectBoundingBox");
-const char * const SPREAD_PAD("pad");
-const char * const SPREAD_REFLECT("reflect");
-const char * const SPREAD_REPEAT("repeat");
+const char * const UNIT_USER_SPACE("USER_SPACE");
+const char * const UNIT_BOUNDING_BOX("OBJECT_BOUNDING_BOX");
+const char * const SPREAD_PAD("PAD");
+const char * const SPREAD_REFLECT("REFLECT");
+const char * const SPREAD_REPEAT("REPEAT");