+#define IS_FILE_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_FILE_ELEMENTS)
+
+#define IS_DRAWABLE_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_DRAWABLE_ELEMENTS)
+
+#define IS_RUNTIME_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_RUNTIME_ELEMENTS)
+
+#define IS_VALID_ELEMENT(e) ((e) >= 0 && \
+ (e) <= MAX_NUM_ELEMENTS)
+