D.09B IMPDEF

5Conditional A group of segments identifying the parties involved in the transaction with associated information. For publicly available implementation guides this includes details of the ownership and origination of the guide.

99999Conditional A group of segments to describe the usage of a segment, a segment group, a composite or an element, an alias, or a constraint in a MIG or IC. The iterations of this segment group form the bulk of the MIG or IC. The MIG or IC consists of a series of iterations of this segment group which describe the target message hierarchy. Within the hierarchy, additional occurrences of this segment group may specify the conditions or relationships between the components. Only the appropriate parts of this segment group should be used as necessary on any particular iteration. The other contained segment groups are ordered to minimise the number of iterations of this segment group. The 'Alias' and 'Constraint' instances of this segment group provide a mechanism for grouping or encapsulating blocks of components. An 'Alias' has no context, and therefore takes on the context of the point at which it is used. A 'Constraint' inherits the context in which it is defined, but may redefine any part of its context by using the appropriate optional segment groups within the main segment loop. As well as its defining function, each component may also be used in a constraining manner. For example, a repeating segment may not only define its components, but also the number of times it is allowed to repeat; then, within each instance, a different combination of element requirements may be expressed. This conditionality may be based on either ordering or content criteria. Once defined, an 'Alias' may be used throughout the MIG where required, by 'using' the definition which is identified by its 'name'. Similarly, in error reporting, an active constraint may be identified by its 'name'.

1Conditional A group of segments to provide authentication for the message.