Storage and retrieval of sequence annotation data

 Bio::DB::GFF provides fast indexed access to a sequence annotation database.
 It supports multiple database types (ACeDB, relational), and multiple schemas
 through a system of adaptors and aggregators.
 .
 The following operations are supported by this module:
 .
  - retrieving a segment of sequence based on the ID of a landmark
 .
  - retrieving the DNA from that segment
 .
  - finding all annotations that overlap with the segment
 .
  - finding all annotations that are completely contained within the
 segment
 .
  - retrieving all annotations of a particular type, either within a
 segment, or globally
 .
  - conversion from absolute to relative coordinates and back again,
 using any arbitrary landmark for the relative coordinates
 .
  - using a sequence segment to create new segments based on relative
 offsets