Features

Feature	Description
Browsing	Snow Owl supports browsing installed terminologies by browsing and filtering the concept hierarchy. The following terminologies are supported: SNOMED CT, ATC, ICD-10, ICD-10-AM, ICD-10-CM, ICD-10-UK, OPCS-4, NICIP, LOINC
Searching	Quick Search allows performing searches across all terminologies from a single location. The Advanced Search dialog can be used for searches on various kinds of resources (e.g. concept status, descriptions, Reference Sets)
Query authoring	Snow Owl includes an advanced editor for ECL and Query Language queries. The editor provides contextual support for query authoring by prompting you based on the ECL language specifications
Query evaluation	Snow Owl's query evaluation engine uses information from the semantic cache, the classifier, and indexes to improve performance
Reference Sets	Reference Sets can be created either manually (extensionally) or automatically (intensionally) with the use of an ECL query. Extensional queries can be imported using the SNOMED CT Simple type Reference Set. Intensional queries are compatible with the SNOMED CT Query Specification type Reference Set and can be optionally converted to manual Reference Sets if desired
Mapping	Mapping between two terminologies is possible using Snow Owl's mapping feature, which is compatible with the SNOMED CT Simple Map type Reference Set format, Complex Map type Reference Set format
High description logic expressibility	On top of the default SNOMED CT ontology expressibility Snow Owl supports the use of universal restriction, negation, disjunction, disjoint classes and concrete domains
Description logic classification	FaCT++, Snow Owl's default reasoner, performs description logic classification in parallel on modern multi-core computers. This allows the full international SNOMED CT plus extensions to be classified and checked for equivalencies in about 10 seconds on a modern desktop computer. Snow Owl is also capable to run Protégé compliant and external reasoners
SNOMED CT support	Working with SNOMED CT is simplified by providing a customized concept editor, navigator, Advanced Search, and query interfaces
ATC classification support	Snow Owl supports mapping to Anatomical Therapeutic Chemical (ATC) codes with a customized navigator and search interface. It's also possible to create and modify ATC codes
ICD-10, ICD-10-AM, ICD-10-CM, ICD-10-UK support	Snow Owl supports browsing and searching ICD-10 classes, as well as mapping them to SNOMED CT via Complex Map type Reference Sets.
OPCS-4	Snow Owl supports browsing and searching OPCS-4 concepts
NICIP	Snow Owl supports browsing and searching NICIP concepts
LOINC	Snow Owl supports browsing and searching LOINC concepts
Extensibility	The Snow Owl framework can be extended by plugging in new terminologies, new editors, new navigation views, new classifiers, and more
Import/export	Snow Owl supports importing and exporting the SNOMED CT release with Reference Sets in RF2 and DVS format, and the ATC Classification in ClaML format