Expression Expression Prefix

1.3.6.1.2.1.90.1.2.1.1.7

An object prefix to assist an application in determining the instance indexing to use in expValueTable, relieving the application of the need to scan the expObjectTable to determine such a prefix. See expObjectTable for information on wildcarded objects. If the expValueInstance portion of the value OID may be treated as a scalar (that is, normally, 0) the value of expExpressionPrefix is zero length, that is, no OID at all. Note that zero length implies a null OID, not the OID 0.0. Otherwise, the value of expExpressionPrefix is the expObjectID value of any one of the wildcarded objects for the expression. This is sufficient, as the remainder, that is, the instance fragment relevant to instancing the values, must be the same for all wildcarded objects in the expression.