Changes in version 1.4.0 (2025-01-29)                  

BUG FIXES

    o   Bug fixes in createCDB, decompose and compose

    o   Previous version required data.table >= 1.14.3 but this was not listed
	as a dependency, now it works with data.table >= 1.12.8

    o   Modifications to display of filenames in loadSNOMED messages to
	correct CRAN errors in Windows build

NEW FEATURES

    o   Option to omit metadata in codelist export

CHANGES

    o   New function addComposeLookupToCDB replaces createComposeLookup to
	add the composition lookup table to the CDB. The composition lookup
	table no longer needs to be supplied as a separate argument to compose

    o   Performance improvements for decompose and relatedConcepts

                  Changes in version 1.3 (2024-10-28)                   

BUG FIXES

    o   Ensure that 'description' returns a 'type' column if there are 0 rows
	and include_synonyms = TRUE

    o   Ensure that 'description' returns only one Fully Specified Name per
	concept, and 'semanticType' returns only a single result per concept

NEW FEATURES

    o   New function 'createTransitive' to generate a transitive closure
	table containing all ancestor-descendant pairs. This makes
	subsequent ancestor / descendant searches quicker

    o   Revised ancestor and descendant functions to be able to use a
	transitive closure table

    o   New function 'addInactiveConcepts' to add inactive concepts to
	codelists, using the history and query tables

    o   New functions 'createCDB' and 'createMiADECDB' to generate a
	concept database and lookups for named entity recognition

    o   New function 'createDisambiguationTrainer' to use longer SNOMED CT
	terms to create texts to help train disambiguation of short terms.

    o   New functions 'decompose', 'batchDecompose' and 'createComposeLookup'
	to create a lookup table for composition of SNOMED CT concepts

    o   New function 'compose' to select a detailed SNOMED CT concept
	based on a general concept and separate concepts for attributes such
	as body site

                  Changes in version 1.2 (2023-04-18)                   

BUG FIXES

    o   as.integer64.SNOMEDconcept now allows additional optional arguments,
	like the generic as.integer64 function

NEW FEATURES

    o   loadSNOMED also optionally loads history and query tables from a
	SNOMED CT distribution

    o   New function addInactiveConcepts to add inactive concepts to
	codelists, using the history and query tables

                         Changes in version 1.1                         

BUG FIXES

    o   Showing a concept description caused an error if there were
	multiple descriptions for a concept and duplicate concepts in the
	SNOMEDconcept vector

    o   SNOMEDcodelist timestamps were set to the user-supplied date instead
	of the system time

    o   Error on exporting SNOMEDcodelists with single row maps that had NULL
	values. Instead the NULLs are now zero-length character vectors, which
	can be exported correctly with fwrite.

    o   Ensure that SNOMED environment is passed from htmlCodelistHierarchy
	to showCodelistHierarchy

    o   Corrected bug in hasAttribute when SNOMED RELATIONSHIP table contains
	duplicate source-type-destination triples (e.g. if some are inactive)

CHANGES

    o   New vignette 'customHierarchy.Rmd' explaining how to create a custom
	SNOMED-like database to enable the hierarchical view

    o   Vignette shows how to obtain 'History of' terms for phenotyping
	algorithms

                  Changes in version 1.0 (2021-11-28)                   

NEW FEATURES

    o   New getMaps function to map a codelist to another terminology
	system

    o   New htmlCodelistHierarchy function to create an interactive HTML
	file to explore a codelist

    o   SNOMED CT simple reference sets included in the SNOMED environment,
	with new function getRefset

    o   Function to load a mapping table from the NHS Digital data
	migration pack (loadREADMAPS), for mapping to Read V2 and CTV3

CHANGES

    o   SNOMEDcodelist S3 data type has been redesigned to include metadata
	as well as accommodate different formats of codelists

    o   SNOMEDcodelist no longer includes descendants by default

    o   SNOMED environment now includes mapping tables and simple refsets

    o   Updated method of displaying SNOMED CT codelists

                  Changes in version 0.2 (2021-07-19)                   

    o   Initial release