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The Semantic Mapping Vocabulary provides and defines terms used for creating and maintaining semantic mappings, in particular mapping metadata.

Identifier of an author or reviewer in the Semion database (now defunct)

The Scientific Event Ontology (SEO) is a reference ontology for modeling data about scientific events such as conferences, symposioums, and workshops.

SEON provides a well-grounded network of software engineering reference ontologies, and mechanisms for deriving and incorporating new integrated domain ontologies into the network. [from homepage]

The Structure-Function Linkage Database (SFLD) is a hierarchical classification of enzymes that relates specific sequence-structure features to specific chemical capabilities. It was developed by the Babbitt Laboratory in collaboration with the UCSF Resource for Biocomputing, Visualization, and Informatics. As of April 2019, the database is in static format, and will not be updated. [from https://interpro-documentation.readthedocs.io/en/latest/sfld.html, accessed March 18th, 2026]

A language for validating RDF graphs against a set of conditions

A vocabulary used in tandem with SHACL for representing node shapes

This shapes graph can be used to validate SHACL shapes graphs against a subset of the syntax rules.

Service Categories (KCDB). This service shows the related service categories for the Key Comparisons DataBase (KCDB) by quantity.

Sigma Aldrich is a life sciences supply vendor.

Identifiers for relationships between proteins and complexes, along with their type and provenance

SILVA is a resource of aligned ribosomal RNA (rRNA) gene sequences for Bacteria, Archaea, and Eukaryotes. It assigns internal, auto-incremented integer identifiers to taxa. However, these identifiers are not persistent nor unique - if the label for a taxon is changed, it assigned a new identifier and the old identifier is removed.

Extends the SIOC Core Ontology (Semantically-Interlinked Online Communities) by defining basic information on permissions and access rights.

An ontology of predicates for actions in SIOC

A vocabulary of argumentation predicates for SIOC

Semantically-Interlinked Online Communities, or SIOC, is an attempt to link online community sites, to use Semantic Web technologies to describe the information that communities have about their structure and contents, and to find related information and new connections between content items and other community objects. SIOC is based around the use of machine-readable information provided by these sites.

Extends the SIOC Core Ontology (Semantically-Interlinked Online Communities) by defining basic information on community-related web services.

Mappings from SIOC to SWAN, with a small number of aux terms

Extends the SIOC Core Ontology (Semantically-Interlinked Online Communities) by defining subclasses and subproperties of SIOC terms.

A modern method of records management and an automated cross-referenced subject index for accurate and comprehensive information retrieval developed by the US FDA's Bureau of Foods

SKIP is aiming to promote the exchange of information and joint research between researchers by aggregating various information of stem cells (iPS cells, iPS cells derived from patients, etc.) to stimulate research on disease and regenerative medicine.

SKOS is an area of work developing specifications and standards to support the use of knowledge organization systems (KOS) such as thesauri, classification schemes, subject heading lists and taxonomies within the framework of the Semantic Web

SKOS-Thes: An extension to SKOS based on the ISO 25964 data model. The ISO 25964 standard, published in 2011, covers all aspects of developing thesauri and setting up mappings across vocabularies to encourage high quality information retrieval across networked resources. [from https://www.dublincore.org/specifications/skos-thes/]

The Simple Knowledge Organization System (SKOS) is a common data model for sharing and linking knowledge organization systems via the Semantic Web. SKOS-XL defines an extension for the Simple Knowledge Organization System, providing additional support for describing and linking lexical entities.This document provides a brief description of the SKOS-XL vocabulary.

The Sri Lanka Clinical Trials Registry (SLCTR) is a Registry for clinical trials involving human subjects, conducted in Sri Lanka or overseas. The SLCTR is a Primary Registry linked to the Registry Network of the International Clinical Trials Registry Platform of the WHO (WHO-ICTRP). It is a not-for-profit Registry, with free and open access to researchers, clinicians, and the general public. (from homepage)

The secondary metabolism collaboratory is a database for secondary metabolite biosynthetic gene clusters. This prefix represents identifiers for individual biosynthetic gene clusters (BGCs) linked to their corresponding bacterial or archaeal source.

The secondary metabolism collaboratory is a database for secondary metabolite biosynthetic gene clusters. This prefix represents identifiers for bacteria and archaea sources linked to their associated set of biosynthetic gene clusters (BGCs).

SMIDs (Small Molecule Identifiers) represent gene-style identifiers for small molecules newly identified in C. elegans and other nematodes. SMIDs aim to make life easier for describing biogenic small molecules in metabolomic and genomic applications.

Documentation of SMILES (Simplified Molecular Input Line Entry System), a line notation (a typographical method using printable characters) for entering and representing molecules and reactions.