The UNL Documentation presents the foundational materials and guidelines produced during the development of the Universal Networking Language. It includes the official UNL Specifications, which define the structure of UNL sentences, Universal Words, relations, and attributes; the UNDL Foundation Recommendations, which provided standards for creating and managing lexical, grammatical, and knowledge-base resources; and the UNLwiki, an archived repository of linguistic resources and documentation. Together, these resources offer a comprehensive view of UNL as a knowledge representation framework and its historical implementation, enabling researchers, linguists, and developers to explore the system’s design, applications, and accumulated data even after the project’s conclusion.
The UNL Specs define the structure of the UNL. They specify the structure of a UNL document, the syntax of a UNL sentence and of Universal Words, the set of relations and attributes and all the information concerning UNL as a formalism.
The UNDLF Recommendations have been stated by the UNDL Foundation (UNDLF) in order to standardize the development of natural language resources (such as lexical databases and grammars) in the UNL R&D network. They comprise:
The UNLwiki served as a central online repository for the documentation of the Universal Networking Language, hosting reference materials developed throughout the life of the UNL Project. It provided information about the formalism, dictionaries, grammar specifications, knowledge bases. In this archived version, the UNLwiki preserves only the visualization and download features: users can explore and retrieve the accumulated data, but editing and updating are no longer available. The UNLwiki remains an important historical record, offering insight into the structure, content, and evolution of UNL as a multilingual knowledge representation system.