This function checks whether resource is sequenced. That is, that its setup and teardown activities are known and that each activity has either a next and a previous activity or is not visited. If an activity does not follow these rules, it is set to “not visited”.

The resource must be closed and have its sequence constraint created.

This function is intended to be used in the search goals IlcSequence and IlcSequenceBackward, which are used for sequencing resources, to check if the sequence found is a valid path.

For more information, see Sequence Constraint.