W3C publishes first draft of YAML-LD 1.0 to simplify linked data formats

The World Wide Web Consortium (W3C) published the First Public Working Draft of YAML-LD 1.0 on 5 March 2026, introducing a proposed method for representing linked data using the YAML data format. The draft was developed by the W3C JSON-LD Working Group, which works on technologies that help structure and connect data on the web.

Linked data is a method used to connect information across the internet so that machines can understand relationships between datasets. It is widely used in areas such as open data portals, knowledge graphs, digital archives, and web services. Traditionally, linked data has often been written using JSON-LD, a format based on the JSON data structure.

The new draft proposes YAML-LD, which adapts the same concepts and rules used in JSON-LD but expresses them using YAML, a text format often considered easier for humans to read and write. YAML is already widely used in areas such as configuration files, application programming interfaces (APIs), and data schemas.

According to the draft, YAML-LD is defined as a set of conventions on top of YAML that allow linked data to be structured in the same way as JSON-LD. This means developers can use YAML’s simpler syntax while still maintaining compatibility with the existing linked-data ecosystem.

Because YAML allows more flexible structures and data types than JSON, the specification also introduces constraints to ensure that YAML-LD documents can always be converted into valid JSON-LD. This compatibility is intended to allow existing tools and applications built for JSON-LD to process YAML-LD documents without major changes.

The publication of the first public working draft marks an early stage in the W3C standards process. The document is open for review and feedback as the working group continues to refine how linked data can be represented in YAML while remaining interoperable with existing web data technologies.