Value keyword refers to a value of data property in a semantic rule. We can also use data properties as variables in semantic sentences. The keyword value(n) is used in the same manner as writing thing(n).


The example shows how to write rules about data property values.

Example: This data range restriction is satisfied when a person has age value between 0 and 17.
If a person has-age equal-to the value(1) and the value(1) is greater-or-equal-to 0 and the value(1) is lower-or-equal-to 18 then the person has-before-adult-age equal-to the value(1).