Rubriikit

Rubriikit is a modular metadata and content organization system designed for digital documents and publications. It provides a lightweight set of tags, called rubriiki, that can be attached to sections, figures, and other objects to encode structure, semantics, and rendering hints. The term is used mainly in theoretical and demonstrational contexts and in some experimental publishing platforms.

The name rubriikit derives from the word rubriik, meaning rubric or section, with a plural suffix used in some language conventions.

Each rubriik consists of an identifier, a category, and an optional set of attributes such as language, priority, or cross-reference targets. Rubriiki can be nested to form hierarchical outlines, and constraints specify permissible parent-child relationships to support consistent navigation.

Rubriikit supports automated generation of tables of contents, search filters, and cross-references. It is used in educational publishing, collaborative authoring tools, and digitization workflows to improve accessibility and reusability of content. Rendering rules ensure consistent headings and navigation across platforms.

Variants include Rubriikit-Core (core tagging subset), Rubriikit-Extended (semantic types and richer attributes), and Rubriikit-JSON (a JSON-LD compatible representation). There is no single official specification; several projects publish informal schemas and best practices.

See also: metadata tagging, document structure, JSON-LD.