obsolete sequence feature collection
true
a collection more than one sequence features (ie a collection of discontinuous sequence features)
1. Note that members of this class can be features with extents of zero (e.g. junctions). This is likely different than the SO:sequence feature class which has members that are regions.
perhaps not same as SO:sequence collection, as here we explicitly include features that can have an extent of zero (and SO:sequence collection is a collection of regions that have an extent of at least one)