# RCSB_EXDB HISTORY
18-Mar-2019 V0.10 Initial version
22-Apr-2019 V0.11 Refining API, separate mock tests fro full cache tests, add taxonomy coverage accessors
23-Apr-2019 V0.12 Consolidated rcsb.exdb.seq into this more general module  (IN PROGRESS)
25-Jun-2019 V0.13 Update development workflows and cleanup
28-Jun-2019 V0.14 Migrating code from py-rcsb_utils_anal module for entity instance extraction
 4-Sep-2019 V0.15 Added tree, chemical reference loader operations and pipeline build tooling
17-Sep-2019 V0.16 Update to latest schemas
30-Sep-2019 V0.17 Updates for chemical reference and tree cli's and update dependencies
15-Oct-2019 V0.18 Refactor, add TaxonomyExtractor(), ReferenceSequenceAssignmentUpdater() and friends.
16-Oct-2019 V0.19 Checkpoint in improving update reference sequences and troubleshooting tree node lists for ATC
17-Oct-2019 V0.20 Checkpoint in refactoring reference sequence update processing.
18-Oct-2019 V0.21 Test version of document-level update of reference sequence assignments
18-Oct-2019 V0.22 Update cache file management
18-Oct-2019 V0.23 Adjust filter behavior, turn off test mode, fix Py27 test parameter.
19-Oct-2019 V0.24 Handle miscellaneous issues in reference sequence processing from Oct 18 full load
20-Oct-2019 V0.25 Handle duplicates from inconsistent struct_ref_* records
