Word properties
From OpenCog
(Redirected from Feature)
RelEx will tag individual words in a sentence with many different possible properties or features. (The tags are also know as unary relations)
For example:
tense(invent, past) pos(invent, verb) pos(sliced, adj) noun_number(bread, uncountable) pos(bread, noun) tense(do, past_infinitive) HYP(do, T) DEFINITE-FLAG(it, T) gender(it, neuter) PRONOUN-FLAG(it, T) pos(it, noun) pos(?, punctuation) QUERY-TYPE(_$qVar, when)
Entity tags
Entity tags (such as the DATE-FLAG) are used to tag the head-word of an entity expression. Additional relations connect the head-word to the rest of the entity. Thus, the entity consists of the head-word, plus all of the dependents. For example:
It happened on December 3rd, 1990.
date-FLAG(December, T) _date_year(December, 1990) _date_day(December, 3rd)
Although only one word is flagged, the rest of the entity is identified through the dependent relations.
It lasted five years.
time-FLAG(years, T) _quantity(years, five)
years is the head-word.
Table of feature tags
The various features are shown in the table below. This table is attempting to be authoritative.
| Simple Name | Examples | Possible values | FeatureNode name |
|---|---|---|---|
| Date | 2 January 1967 | T | date-FLAG |
| Quantification definite determiner | The, it | T | definite-FLAG |
| Emoticon | ;-) :-@ | T | emoticon-FLAG |
| Gender | He, she, John, Mary, Pat | masculine, feminine, person, neuter | gender |
| Idiom - idiomatic phrases identified by parser | some_more | T | idiom-FLAG |
| Location | New York | T | location-FLAG |
| Unit of measure | cm, Hz, newton | T | measure-FLAG |
| Money | two shekels | T | money-FLAG |
| Number | singular, plural, uncountable | noun_number | |
| Organization | IBM Corp. | T | organization-FLAG |
| PartOfSpeech | adj, adv, conjunction, det, noun, particle, prep, punctuation, verb, WORD | POS | |
| Person | John, Mary Derwinski, Pat | T | person-FLAG |
| Polyword -- phrasal verbs w/ particle, comparisons w/ particle | go_away, as_many | T | polyword-FLAG |
| Pronoun | He, she | T | pronoun-FLAG |
| Query | how, how_much, what, when, where, which, who, why | QUERY-TYPE | |
| Tense | future, future progressive, imperative, infinitive, past, past infinitive, past progressive, perfect, present, present progressive, progressive | tense | |
| Time | five years | T | time-FLAG |
Notes
- If a phrase is tagged with a part-of-speech of "verb" and is also tagged as a polyword, it should be understood to be a phrasal verb.
- Tense tags can be combined with underscores; for example, tense(die, present_perfect) for has died. This is generated by RelEx in place of the aux and auxpass relations.
