||An EVENT will refer to a number of ITEMs which will take roles in the EVENT.
So, for example, a PERSON may take the role 'applicant', in one EVENT, and the same person may take the role 'patient', in another EVENT.
All types of ITEM can take roles in an EVENT, so for example
* a candlestick as an OBJECT could be the murder weapon in a crime EVENT.
* a tender as an ABSTRACT could be the subject of a contract signing EVENT.
An EVENT might occur over a very short period of time, e.g. a lightening flash, or a very long period of time, e.g. formation of the continents.