taggede

Taggede is a framework for collaborative tagging and annotation of digital resources designed to improve interoperability and provenance across platforms. It provides a standard grammar for encoding tags, tag relations, and contextual notes, and it offers a decentralized ledger-backed backend that records tagging events while aiming to protect user privacy.

The core concept is the Taggede Graph, a lightweight data model in which resources, tags, and relationships are represented as interconnected nodes and edges. Tags attach to items via tag edges; relationships can express hierarchies, synonyms, or semantic connections. Taggede aligns with existing vocabularies such as SKOS, Dublin Core, and schema.org to foster cross-system interoperability.

Governance and privacy are built into Taggede. The system supports opt-in privacy models, access controls, and cryptographic provenance for tag events. Changes can be proposed, reviewed, and either approved or deprecated through moderation workflows. Taggede uses versioning and content-addressable storage to support reproducibility and offline tagging with later synchronization.

Taggede originated in a collaborative research initiative, the Taggede Consortium, founded in 2023 by librarians, data scientists, and software engineers. A published specification and reference implementations followed in 2024–25 under an open-source license, with ongoing community governance and updates to accommodate new vocabularies and data domains.

In practice, Taggede is used by digital libraries, research repositories, and media platforms to tag datasets, documents, and media assets in a harmonized way. It enables search and discovery by tag, context, and relationships; supports reuse of tagging vocabularies; and facilitates cross-platform data exchange and collaborative curation.