Grammar Specs
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| + | == Basic symbols == | ||
| + | |||
| + | {| border="1" cellpadding="2" align=center | ||
| + | |+Basic symbols used in UNL grammar rules | ||
| + | !Symbol | ||
| + | !Definition | ||
| + | !Example | ||
| + | |- | ||
| + | |align=center|<nowiki>^</nowiki> | ||
| + | |not | ||
| + | |^a = not a | ||
| + | |- | ||
| + | |align=center|{ | } | ||
| + | |or | ||
| + | |<nowiki>{a|b}</nowiki> = a or b | ||
| + | |- | ||
| + | |align=center|% | ||
| + | |index for nodes, attributes and values | ||
| + | |%x (see [[#Indexes|below]]) | ||
| + | |- | ||
| + | |align=center|# | ||
| + | |index for sub-NLWs | ||
| + | |#01 (see [[#Indexes|below]]) | ||
| + | |- | ||
| + | |align=center|= | ||
| + | |attribute-value assignment | ||
| + | |POS=NOU | ||
| + | |- | ||
| + | |align=center|! | ||
| + | |rule trigger | ||
| + | |!PLR | ||
| + | |- | ||
| + | |align=center|& | ||
| + | |merge operator | ||
| + | |%x&%y | ||
| + | |- | ||
| + | |align=center|? | ||
| + | |dictionary lookup operator | ||
| + | |?[a] | ||
| + | |- | ||
| + | |align=center|“ “ | ||
| + | |string | ||
| + | |"went" | ||
| + | |- | ||
| + | |align=center|[ ] | ||
| + | |natural language entry (headword) | ||
| + | |[go] | ||
| + | |- | ||
| + | |align=center|[[ ]] | ||
| + | |UW | ||
| + | |[[to go(icl>to move)]] | ||
| + | |- | ||
| + | |align=center|( ) | ||
| + | |node | ||
| + | |(a) | ||
| + | |- | ||
| + | |align=center|// | ||
| + | |regular expression | ||
| + | |/a{2,3}/ = aa,aaa | ||
| + | |} | ||
| + | |||
| + | == Basic Concepts == | ||
| + | |||
| + | |||
| + | |||
| + | |||
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| + | ;The differences between "", [] and [[]] | ||
| + | :Double quotes are always used to represent strings: "a" will match only the string "a" | ||
| + | :Simple square brackets are always used to represent natural language entries (headwords) in the dictionary: [a] will match the node associated to the entry [a] retrieved from the dictionary, no matter its current realization, which may be affected by other rules (the original [a] may have been replaced, for instance, by "b", but will still be indexed to the entry [a]) | ||
| + | :Double square brackets are always used to represent UWs: <nowiki>[[a]]</nowiki> will match the node associated to the UW <nowiki>[[a]]</nowiki> | ||
| + | |||
| + | ;Predefined values (assigned by default) | ||
| + | :SCOPE - Scope | ||
| + | :SHEAD - Sentence head (the beginning of a sentence) | ||
| + | :STAIL - Sentence tail (the end of a sentence) | ||
| + | :CHEAD - Scope head (the beginning of a scope) | ||
| + | :CTAIL - Scope tail (the end of a scope) | ||
| + | :TEMP - Temporary entry (entry not found in the dictionary) | ||
| + | :DIGIT - Any sequence of digits (i.e.: 0,1,2,3,4,5,6,7,8,9) | ||
Revision as of 19:29, 16 August 2013
Basic symbols
| Symbol | Definition | Example |
|---|---|---|
| ^ | not | ^a = not a |
| { | } | or | {a|b} = a or b |
| % | index for nodes, attributes and values | %x (see below) |
| # | index for sub-NLWs | #01 (see below) |
| = | attribute-value assignment | POS=NOU |
| ! | rule trigger | !PLR |
| & | merge operator | %x&%y |
| ? | dictionary lookup operator | ?[a] |
| “ “ | string | "went" |
| [ ] | natural language entry (headword) | [go] |
| [[ ]] | UW | [[to go(icl>to move)]] |
| ( ) | node | (a) |
| // | regular expression | /a{2,3}/ = aa,aaa |
Basic Concepts
- The differences between "", [] and [[]]
- Double quotes are always used to represent strings: "a" will match only the string "a"
- Simple square brackets are always used to represent natural language entries (headwords) in the dictionary: [a] will match the node associated to the entry [a] retrieved from the dictionary, no matter its current realization, which may be affected by other rules (the original [a] may have been replaced, for instance, by "b", but will still be indexed to the entry [a])
- Double square brackets are always used to represent UWs: [[a]] will match the node associated to the UW [[a]]
- Predefined values (assigned by default)
- SCOPE - Scope
- SHEAD - Sentence head (the beginning of a sentence)
- STAIL - Sentence tail (the end of a sentence)
- CHEAD - Scope head (the beginning of a scope)
- CTAIL - Scope tail (the end of a scope)
- TEMP - Temporary entry (entry not found in the dictionary)
- DIGIT - Any sequence of digits (i.e.: 0,1,2,3,4,5,6,7,8,9)
