Elaboration

In RST, the Elaboration relation is used to provide additional information about a situation or some element. The satellite provides the additional information for the nucleus. RST provides a list of specific relation types between the information of nucleus and satellite for the Elaboration relation:

• set :: member
•  abstraction :: instance
• whole :: part
• object :: attribute
• generalization :: specific

For the use in dialogs, the Procedural Semantics is shown in Figure Elaboration as a state chart. It allows either to execute only the nucleus, or nucleus and satellite in parallel,depending on the internal state of the corresponding communication party (e.g., a presentation of products of a specified category can only be provided, if category is specified through the internal state of the corresponding communication party. This decency is modeled with the choice element in the state chart. The finishing of one of these branches terminates the execution of the whole Elaboration relation.