World Wide Web Consortium

A JSON-LD vocabulary for representing social activities, powering ActivityPub and the fediverse.

A W3C protocol for decentralized social networking, enabling server-to-server federation across the fediverse.

A W3C standard for annotating CSV files with datatypes, relationships, and conversion rules.

A W3C vocabulary for describing datasets and data services in federated catalogs on the web.

Provides structured concepts for describing personal data processing, privacy rights, and legal bases.

Provides an RDF vocabulary for describing and assessing data quality dimensions, metrics, and certificates.

The dominant open format for reflowable digital books, packaging HTML, CSS, and media in one file.

Describes hypermedia-driven Web APIs in machine-readable form, enabling clients to discover operations at runtime.

Embeds linked data semantics in ordinary JSON using a lightweight context mechanism.

Represents lexicographic and linguistic data as RDF, linking lexical entries to ontology concepts and meanings.

Defines HTTP conventions for reading, creating, updating, and deleting linked data resources and containers.

A W3C standard for encoding mathematical notation and semantics in XML for the web.

Expresses machine-readable policies for permissions, prohibitions, and obligations over digital content.

A knowledge representation language for building formal, machine-reasoned ontologies on the Semantic Web.

Models the provenance of data and things by tracking entities, activities, and the agents responsible.

Expresses customized mappings from relational database schemas and data to RDF datasets using a standard language.

Publishes multi-dimensional statistical and aggregate data as linked data using RDF and SDMX concepts.

Adds classes, properties, and type hierarchies to raw RDF triples for simple ontological modeling.

The graph-based data model of subject-predicate-object triples that underpins the entire Semantic Web.

Embeds structured RDF metadata directly within HTML and XML markup using simple element attributes.

Models sensors, actuators, and their observations for IoT, scientific monitoring, and smart cities.

Validates RDF graphs against shape definitions that constrain structure, types, and values.

Represents thesauri, taxonomies, and classification schemes as machine-readable linked data.

A decentralized web platform that gives individuals control over their personal data through linked data pods.

The standard query language and protocol for retrieving and manipulating data stored in RDF format.

A compact, human-readable syntax for writing RDF graphs using subject-predicate-object triples.

A core ontology for publishing organizational structures, membership, and hierarchy as linked data.

An OWL ontology for temporal concepts including instants, intervals, durations, and calendar systems.

An OWL ontology that brings contact information from the vCard standard into the Semantic Web.

A data model for issuing tamper-evident digital credentials that holders can present and verifiers can trust.

An RDF vocabulary for describing the structure, access methods, and linkage of published datasets.

Provides simple latitude, longitude, and altitude properties for describing geographic locations in RDF graphs.

A structured model for attaching comments, tags, and other content to specific parts of web resources.