23.12d Editing of NCI Thesaurus 23.12d was completed on Dec 26, 2023. Version 23.12d was December's fourth build in our development cycle. This directory contains files: ReadMe.txt This file Thesaurus_23.12d.FLAT.zip The NCI Thesaurus 23.12d in flat file format Thesaurus.FLAT.zip Same as above but without a version tag Thesaurus_23.12d.OWL.zip The NCI Thesaurus 23.12d in OWL2 Thesaurus.OWL.zip Same as above but without a version tag ThesaurusInf_23.12d.OWL.zip The NCI Thesaurus 23.12d, inferred, in OWL2 format ThesaurusInf.OWL.zip Same as above but without a version tag The zip files unpack the following files: Thesaurus_23.12d.FLAT.zip Thesaurus.txt Thesaurus.FLAT.zip Thesaurus.txt Thesaurus_23.12d.OWL.zip Thesaurus.owl Thesaurus.OWL.zip Thesaurus.owl ThesaurusInf.OWL.zip ThesaurusInferred.owl ThesaurusInf_23.12d.OWL.zip ThesaurusInferred.owl In the first two formats below, the relations are as stated by the editors, no inferred relations are specified. The Thesaurus.txt flat file is in tab-delimited format. Included in this format are all the terms associated with NCI Thesaurus concepts (names and synonyms), a text definition of the concept (if one is present), and stated parent-child relations, sufficient to reconstruct the hierarchy. The fields are: code concept IRI parents synonyms definition display name concept status semantic type concept in subset The "parents" field contains the codes of the superconcept(s). If a field contains multiple entries, these are pipe-delimited. For root concepts without "parents", this field is empty. The first entry in the "synonyms" field is the preferred name of the concept. The "definition" field contains only one definition if more than one definition is associated with the concept; not all concepts contain definitions. A "display_name", "concept status" or "concept in subset" may contain zero values. The "semantic type" field is guaranteed to contain one or more values. Please see the OWL2_Announcement.txt for details on the changes made to comply with OWL2: https://evs.nci.nih.gov/ftp1/NCI_Thesaurus/OWL2_Announcement.txt The Thesaurus.owl file contains the entire terminology expressed in the Web Ontology Language (OWL), and the rdf:about (rdf:ID) utilizes semantically meaningless identifiers, e.g. "C123456", which is the value of the "code" property. Relations are as stated by the editors; no inferred relations are specified. Annotations of use only to the EVS (for example, editor's notes) are absent in the released terminology. The rdf:about of annotation and object properties are also replaced with their corresponding codes. The unzipped Thesaurus.owl is available directly at http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl The ThesaurusInferred.owl file contains the terminology from the NCI Thesaurus but excludes retired concepts and includes inferred relationships. This file is created for import into the UMLS and NCI Metathesaurus. Properties of use only to the EVS (e.g. editor notes) are absent in the released terminology. It also uses semantically meaningless rdf:about identifiers as described above. The file nci_code_cui_map_202308.dat contains the map of NCI Thesaurus (NCIt) codes to NCI Metathesaurus (NCIMeta) CUIs (concept unique identifier). The format of the file is code CUI . The CUIs are either derived from the UMLS Metathesaurus (CUIs that begin with "C-digit") or specific to the NCI Metathesaurus (CUIs that begin with "CL"). This mapping file is created for each release of the NCIMeta, which is published on a biannually schedule hence is not current with every release of NCIt which is published monthly. Newly created Thesaurus concepts will not appear in this file until the next release of the Metathesaurus, and newly retired Thesaurus concepts will continue to appear until the next release of the Metathesaurus. Archived mapping files may be found in the archives directory beneath the last release of Thesaurus it was generated from. The current mapping file is derived from NCIt version 23.12d and NCIMeta version 202308. For previous releases of the NCI Thesaurus please see the archives at ftp://ftp1.nci.nih.gov/pub/cacore/EVS/NCI_Thesaurus/archive/ For additional information, please see the LexEVS summary page. (https://wiki.nci.nih.gov/display/EVS/LexEVS+Servers+and+APIs+Summary)