Enum contaning all keywords used as configuration parameter in builtin evaluator of SearchExpression.
| None | Unrecognized keyword. |
| Asc | Asc (contraction of Ascending). Used in sor{} to define the sorting order. |
| Desc | Desc (contraction of Descending). Used in sor{} to define the sorting order. |
| Any | Any keyword. |
| All | All keyword. |
| Keep | Indicates to keep results from first set. |
| Sort | Indicates to yield sorted results. |