NLPA Controlled Language

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NLPA Controlled Language von Mind Map: NLPA Controlled Language

1. examples

1.1. Every card is inserted into every slot.

1.1.1. If there is a card X1 then if there is a slot X2 then the card X1 is inserted into the slot X2.

1.1.2. [] [A] object(A,card,countable,na,eq,1)-1/2 => [] [B] object(B,slot,countable,na,eq,1)-1/7 => [C,D] property(C,inserted,pos)-1/4 predicate(D,be,A,C)-1/3 modifier_pp(D,into,B)-1/5

1.2. Mary cuts the card with the scissors.

1.2.1. [A,B,C] object(C,card,countable,na,eq,1)-1/4 object(B,scissors,countable,na,eq,1)-1/9 predicate(A,cut,named(Mary),C)-1/2 modifier_pp(A,with,B)-1/5

1.3. The man inserts the card with the code.

1.3.1. There is a man X1. The man X1 inserts a card with a code.

1.3.2. warning anaphor 1 The definite noun phrase 'the man' does not have an antecedent and thus is not interpreted as anaphoric reference, but as a new indefinite noun phrase.

1.3.3. [A,B,C,D] object(D,man,countable,na,eq,1)-1/2 object(C,card,countable,na,eq,1)-1/5 object(B,code,countable,na,eq,1)-1/8 predicate(A,insert,D,C)-1/3 modifier_pp(A,with,B)-1/6

2. details

2.1. anaphora

2.1.1. John sees Jack. He is busy today.

2.1.2. reference "he" is ambiguous

2.1.3. in natural languages, resolve from context

2.1.4. even regular phrases: "the car", "a car"... which do they refer to?

2.1.5. possible rule: most recent grammatically feasible match

2.1.6. NB: incorrect anaphora hard to detect automatically

2.2. predefined vocabulary

2.2.1. predefined function words ("the", "for", "with", etc.)

2.2.2. predefined phrases "it is false that..." "it is possible that..."

2.2.3. predefined content words with ambiguities resolved

2.3. syntax

2.3.1. well defined syntax (parseable)

2.3.2. subset of regular English

2.3.3. fairly powerful subset

2.4. ambiguity

2.4.1. sentences frequently are ambiguous

2.4.2. "A customer inserts a card with a code."

2.4.3. Is that instrumental or a property?

2.4.4. resolution could define "always instrumental" some exceptions

2.4.5. NB: errors in resolution by making a canonical choice is hard to detect automatically

3. controlled language

3.1. general view

3.1.1. language encodes knowledge

3.1.2. knowledge is logical statements about the world

3.1.3. "Every human being has a father and a mother. John is a human being". Does John have a father?"

3.2. machine translation view

3.2.1. translate statements in the source language into logical statements

3.2.2. translate logical statements back into target language

3.2.3. i.e., transfer-based MT with logic as intermediate

3.3. issues

3.3.1. which language should we use?

3.3.2. first order logic?

3.3.3. temporal logic?

3.3.4. Bayesian statistics?

3.4. idea

3.4.1. use something "like" natural language to express knowledge

3.4.2. instead of second-guessing meaning of natural language, control the language so that it remains intelligible but is more readable to machines

3.4.3. detect and signal errors

3.5. lots of interest

3.5.1. ontologies for the semantic web

3.5.2. automatic translation of instruction manuals etc.

3.5.3. automatically analyzable engineering and software specifications

3.6. promise

3.6.1. a lot of language *is* about things that can be expressed as logic

3.6.2. a lot of language can be interpreted as logical statements simply syntactically

3.7. problems

3.7.1. the logical content of language requires context and background knowledge to extract; it's not just parsing

3.7.2. a lot of language probably isn't about things that can be expressed in terms of logical statements

3.8. two forms

3.8.1. formal controlled languages: they have an exact syntax and semantics (but look natural) Clone Attempto

3.8.2. informal controlled language: recommendations for making language more suitable for a particular purpose, but not formally specified Basic English used for broadcasts, international language E-prime no use of "to be" limit of "they", "the ____", etc. "X is Y" -> "X remains Y", "X equals Y", "X becomes Y"

3.9. online translation

3.9.1. simplify! you can use controlled language yourself.

3.9.2. The car driven around the lot stopped. Das Auto auf der viel gefahren gestoppt.

3.9.3. The car was driven around the parking lot. The car stopped. Das Auto wurde auf dem Parkplatz gefahren. Der Wagen hielt

3.9.4. simplify stick to unambiguous words use simple grammatical structures limit anaphora, make them unambiguous

3.10. traditional attempts

3.10.1. simple English / basic English

3.10.2. Loglan

3.10.3. COBOL, SQL, etc.

4. conclusions

4.1. interesting questions

4.1.1. how would law, contracts, science, politics change if language was clear, logical, and unambiguous

4.1.2. what could we do if we could capture knowledge as found in Wikipedia?

4.1.3. can we translate regular English into controlled English?

4.2. success?

4.2.1. controlled language has become more popular recently

4.2.2. not that much used for machine translation yet, few tools

4.2.3. examples Gellish Attempto

4.3. think about

4.3.1. simple parsers for controlled languages

4.3.2. controlled languages as an interlingua

4.3.3. English -> controlled having well-defined, unambiguous meanings for texts would be useful in many contexts, not just MT as a semantics checker (how would people interpret this?) as a binding definition of the meaning of the text (e.g., for laws)