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KEGG ENZYME is an implementation of the Enzyme Nomenclature (EC number system) produced by the IUBMB/IUPAC Biochemical Nomenclature Committee. KEGG ENZYME is based on the ExplorEnz database at Trinity College Dublin, and is maintained in the KEGG relational database with additional annotation of reaction hierarchy and sequence data links.

KEGG RCLASS contains classification of reactions based on the chemical structure transformation patterns of substrate-product pairs (reactant pairs), which are represented by the so-called RDM patterns.

An ontology for harmonizing and extending severeral existing resources in the vaccine and immunology domains

A cross-sectoral metadata profile for describing teaching and learning resources, primarily based on [schema.org](https://schema.org) and the Learning Resource Metadata Initiative LRMI, and additionally utilizing elements of the Simple Knowledge Organization System SKOS. A JSON-LD11-compliant data structure is defined in the form of this HTML specification, including a JSON schema against which data can be automatically checked for conformity with the profile.

Identifiers describing conditions of access to an object (login) as defined by the [OER metadata group](https://oerworldmap.org/resource/urn:uuid:fd06253e-fe67-4910-b923-51db9d27e59f).

A controlled vocabulary for education levels, such as primary eduation, secondary education, and post-secondary education

A classification of subjects in Hochschule (universities of applied sciences)

A vocabulary describing licenses for data and code

A vocabulary describing subjects taught in German primary and secondary school (not university/hochschulen), such as German, math, and art.

Langual stands for "langua alimentaria" or "language of food". it is an automated method for describing, capturing and retrieving data about food. the work on langual was started in the late 1970's by the center for food safety and applied nutrition (cfsan) of the united states food and drug administration as an ongoing co-operative effort of specialists in food technology, information science and nutrition. the thesaurus provides a standardized language for describing foods, specifically for classifying food products for information retrieval. langual is based on the concept that: - any food (or food product) can be systematically described by a combination of characteristics - these characteristics can be categorized into viewpoints and coded for computer processing - the resulting viewpoint/characteristic codes can be used to retrieve data about the food from external databases

The Lebanese Clinical Trials Registry is an online register of clinical trials being undertaken in Lebanon. It includes trials that target humans from the full spectrum of therapeutic areas of pharmaceuticals, surgical procedures, preventive measures, lifestyle, devices, treatment and rehabilitation strategies and complementary therapies. (from homepage)

LCCN Permalinks are persistent URLs for bibliographic records in the LC Catalog and authority records in LC Authorities. These links are constructed using the record's LCCN (or Library of Congress Control Number), an identifier assigned by the Library of Congress to bibliographic and authority records. LCCN Permalinks are also available for citation records in the Handbook for Latin American Studies (HLAS). [from homepage]

Library of Congress Subject Headings (LCSH) has been actively maintained since 1898 to catalog materials held at the Library of Congress. (from homepage)

A subset of Library of Congress (LOC) subject headings

The data model underlying lexvo

The LIDO Terminology is committed to the Linked Open Data paradigm by making each LIDO Term referenceable through a Uniform Resource Identifier (URI). It is recommended best practice to use the URI from the terminology.lido-schema.org/ namespace to indicate the type of a LIDO element or attribute. The primary objective of this practice is to support data providers in adapting or mapping their data structures to LIDO, thus facilitating the processing of LIDO data for service providers, increasing the interoperability of LIDO data, and supporting information retrieval across different collections. [from homepage]