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| The following Grammar Specs are used for writing rules for the UNDL Foundation tools ([[IAN]], [[EUGENE]], [[SEAN]], [[NORMA]], etc.).
| | #REDIRECT [[Grammar]] |
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| == Basic Symbols ==
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| {{:Basic Symbols}}
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| == Basic Concepts ==
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| [[file:grammar.png|center]]
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| ;[[Node]]
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| :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.
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| ;[[Relation]]
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| :In order to form a natural language sentence or a UNL graph, nodes are inter-related by relations. In the UNL framework, there can be three different types of relations: linear, syntactic or semantic.
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| ;[[Hyper-Node]]
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| :A hyper-node is a sub-graph, i.e., a node containing relations between nodes.
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| ;[[Hyper-Relation]]
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| :A hyper-relation is a relation between relations.
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