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[[file:grammar.png|center|200px]] ;[[Node]] :A node is the most elementary unit in the graph. It is the result of the [[tokenization]] process, and corresponds to the notion of "lexical item". At the surface level, a natural language sentence is considered a list of nodes, and a UNL graph a set of relations between nodes. ;[[Relation]] :In order to form a natural language sentence or a UNL graph, nodes are inter-related by relations. In the UNL framework, there are three different types of relations: the linear (list) relation, syntactic relations and semantic relations. ;[[Hyper-Node]] :A hyper-node is a sub-graph, i.e., a node containing relations between nodes. ;[[Hyper-Relation]] :A hyper-relation is a relation between relations.

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