hm_add_events           Add events to entities
hm_add_periods          Add periods to entities
hm_add_values           Add values (or measures) to entities
hm_close                Close database file
hm_delete_domains       Delete specified domains from project database
hm_delete_entities      Delete specified entity elements (events,
                        periods, values) from project database
hm_delete_views         Delete specified views from project database
hm_export_marks         Export entity marks
hm_open                 Open database file for use in subsequent
                        heimdall R functions
hm_reset                Clear all data inside database
hm_set_domain           Create or replace domain
hm_set_view             Create or replace view
