Grammar Specs
From UNLwiki
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)
