This enumeration identifies attributes common for all annotations.
Values:
| IG_ARTX_ATTR_MARK_TYPE | Identifies annotation type ID. |
| IG_ARTX_ATTR_MARK_BOUNDS | Identifies annotation bounding rectangle. |
| IG_ARTX_ATTR_MARK_VISIBLE | Identifies annotation visibility state. |
| IG_ARTX_ATTR_MARK_USER_DATA | Identifies user data associated with annotation. |
| IG_ARTX_ATTR_MARK_TOOLTIP | Identifies tooltip text string associated with annotation. |
| IG_ARTX_ATTR_MARK_HITTEST_BOUNDS | Identifies annotation hit-test bounds. Read-only attribute. |