Table 2.
The class hierarchy and definitions for EliXR-TIME
| Class | Subclass | Definition | Examples |
|---|---|---|---|
| Event | Atomic Event | An occurrence specified by a noun-phrase representing a time interval. Both of the semantic annotation labels event and anchor can be instances of this class | Expected survival, active inflammation, had a baby |
| Combinatory Events | A group of events related via a conjunction or disjunction | History of alcohol or drug abuse | |
| Duration | Fixed | A duration whose upper and lower limits are both clearly stated and do not form a range but a period | Jan. 20th, 2006, 3 weeks, 2 years, 11:00 am |
| Comparative | A duration with one clearly specified upper or lower limit coupled with a comparison operator | Less than 6 weeks | |
| Range | A duration bounded on both sides by upper and lower limits (maximum, minimum) | More than 28 days but within 12 weeks | |
| Relative Time Interval | ------- | An interval with a clearly defined begin point and end point that is relative to some medical occurrence | A period starting from 6 months [begin point] prior to administration of the vaccine [end point] |
| Allen Temporal Relation | ------- | The 13 Allen temporal relations | After, before, during, equals, meets, finishes, overlap, starts |
| Frequency Constraint | ------- | A temporal pattern characterized by a recurring event of a specified duration. The name is based in part on work taking place on a Generalized ERGO Annotation | Greater than three stools per day [recurring event] for greater than 7 days [duration] |
| Temporal Arithmetic Expression | ------- | An arithmetic expression that returns an instantaneous interval (similar to a time-point) using a calculation. After and before represent a time lag (+ or −) rather than an Allen temporal relation |
4 weeks before study treatment; 6 months prior to administration of the vaccine |
| Temporal Logical Expression | ------- | A temporal comparison expression that returns a Boolean result. It uses Allen’s temporal relations where after and before are comparison operators and not time lags | Administration or planned administration of immunoglobulins and/or any blood products during a period |