This enumeration specifies available annotation types.
Values:
| IG_ARTX_MARK_SELECT | Select mark. |
| IG_ARTX_MARK_IMAGE_EMBEDDED | Embedded mark. |
| IG_ARTX_MARK_IMAGE_REFERENCE | Reference mark. |
| IG_ARTX_MARK_LINE | Line mark. |
| IG_ARTX_MARK_FREEHAND_LINE | Freehand line mark. |
| IG_ARTX_MARK_HOLLOW_RECTANGLE | Hollow rectangle mark. |
| IG_ARTX_MARK_FILLED_RECTANGLE | Filled rectangle mark. |
| IG_ARTX_MARK_TYPED_TEXT | Typed text mark. |
| IG_ARTX_MARK_TEXT_FROM_FILE | Text-from-File mark. |
| IG_ARTX_MARK_TEXT_STAMP | Text stamp mark. |
| IG_ARTX_MARK_ATTACH_A_NOTE | Attach-a-note mark. |
| IG_ARTX_MARK_FILLED_POLYGON | Filled polygon mark. |
| IG_ARTX_MARK_HOLLOW_POLYGON | Hollow polygon mark. |
| IG_ARTX_MARK_POLYLINE | Polyline mark. |
| IG_ARTX_MARK_AUDIO | Audio mark. |
| IG_ARTX_MARK_FILLED_ELLIPSE | Filled ellipse mark. |
| IG_ARTX_MARK_HOLLOW_ELLIPSE | Hollow ellipse mark. |
| IG_ARTX_MARK_ARROW | Arrow mark. |
| IG_ARTX_MARK_HOTSPOT | Hotspot mark. |
| IG_ARTX_MARK_REDACTION | Redaction mark. |
| IG_ARTX_MARK_ENCRYPTION | Encryption mark. |
| IG_ARTX_MARK_RULER | Ruler mark. |
| IG_ARTX_MARK_PROTRACTOR | Protractor mark. |
| IG_ARTX_MARK_BUTTON | Button mark. |
| IG_ARTX_MARK_PIN_UP_TEXT | Pin-up text mark. |
| IG_ARTX_MARK_HIGHLIGHTER | Highlighter mark. |
| IG_ARTX_MARK_RICH_TEXT | Rich text mark. |
| IG_ARTX_MARK_POINT | Point mark. |
| IG_ARTX_MARK_CURVE | Curve mark. |
| IG_ARTX_MARK_CALLOUT | Callout mark. |
| IG_ARTX_MARK_RECTANGLE | Rectangle mark. |
| IG_ARTX_MARK_ELLIPSE | Ellipse mark. |
| IG_ARTX_MARK_POLYGON | Polygon mark. |
| IG_ARTX_MARK_TEXT | Text mark. |
| IG_ARTX_MARK_IMAGE | Image mark. |