Grammar Specs

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The following Grammar Specs are used for writing rules for the UNDL Foundation tools ([[IAN]],[[EUGENE]],[[SEAN]],[[NORMA]],etc.).
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#REDIRECT [[Grammar]]
 
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== Basic symbols ==
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{| border="1" cellpadding="2" align=center
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|+Basic symbols used in UNL grammar rules
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!Symbol
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!Definition
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!Example
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|-
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|align=center|<nowiki>^</nowiki>
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|not
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|^a = not a
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|-
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|align=center|{ | }
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|or
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|<nowiki>{a|b}</nowiki> = a or b
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|-
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|align=center|%
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|index for nodes, attributes and values
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|%x (see [[#Indexes|below]])
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|-
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|align=center|#
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|index for sub-NLWs
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|#01 (see [[#Indexes|below]])
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|-
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|align=center|=
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|attribute-value assignment
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|POS=NOU
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|-
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|align=center|!
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|rule trigger
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|!PLR
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|-
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|align=center|&
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|merge operator
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|%x&%y
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|-
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|align=center|?
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|dictionary lookup operator
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|?[a]
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|-
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|align=center|“ “
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|string
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|"went"
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|-
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|align=center|[ ]
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|natural language entry (headword)
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|[go]
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|-
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|align=center|[[ ]]
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|UW
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|[[to go(icl>to move)]]
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|-
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|align=center|( )
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|node
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|(a)
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|-
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|align=center|//
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|regular expression
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|/a{2,3}/ = aa,aaa
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|}
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== Basic concepts ==
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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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Latest revision as of 18:11, 19 August 2013

  1. REDIRECT Grammar
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