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'''D-rules''' (disambiguation rules) are used to prevent wrong lexical choices, to provoke best matches and to check the consistency of graphs, trees and lists. Differently from [[t-rule]]s, they do not provoke transformations, but induce or block them, by assigning priorities to natural language phenomena. The set of d-rules form the disambiguation grammar, or [[d-grammar]].
'''D-rules''' or Disambiguation rules are used to prevent wrong lexical choices, to provoke best matches and to check the consistency of graphs, trees and lists. Differently from [[t-rule]]s, they do not provoke transformations, but induce or block them, by assigning priorities to natural language phenomena. The set of d-rules form the '''Disambiguation grammar''', or '''D-Grammar'''.


== Syntax ==
== Syntax ==
Line 9: Line 9:
STATEMENT is the left side (condition) of a [[L-rule]] or a [[S-rule]]; and<br />
STATEMENT is the left side (condition) of a [[L-rule]] or a [[S-rule]]; and<br />
P, which can range from 0 (impossible) to 255 (necessary), is the probability of occurrence of the STATEMENT<br />
P, which can range from 0 (impossible) to 255 (necessary), is the probability of occurrence of the STATEMENT<br />
== Types of Disambiguation Rules ==
There are three types of disambiguation rules:
*Network disambiguation rules
*Tree disambiguation rules
*List disambiguation rules
=== Network Disambiguation Rules ===
Network disambiguation rules apply over the network structure of UNL graphs to constrain the application of Tree-to-Network (TN) and Network-to-Network (NN) Transformation Rules. They have the following format:
SEM(A;B)=P;
Where SEM is a semantic relation, A and B are nodes, and P is an integer (from 0 to 255).
==== Examples ====
;agt(VER;ADJ)=0;
:An adjective (ADJ) may not be an agent (agt) of a verb (VER).
;agt(VER;NOU)=255;
:Agents (agt) of verbs (VER) are always nouns (NOU).
==== Use ====
{|cellpadding="5" border="1" align="center"
!INPUT
!TRANSFORMATION RULES
!DISAMBIGUATION RULES
!OUTPUT
|-
|SYN(A,B,C;D,E,F)
|SYN(A;D)=agt(;); (higher priority)<br />SYN(A;E)=aoj(;); (lower priority)
|agt(A;F)=0;
|aoj(A,B,C;D,E,F)
|}
=== Tree Disambiguation Rules ===
Tree disambiguation rules apply over the intermediate tree structure to constrain the application of List-to-Tree (LT), Network-to-Tree (NT) and Tree-to-Tree (TT) Transformation Rules. They have the following format:
SYN(A;B)=P;
Where SYN is a syntactic relation, A and B are nodes, and P is an integer (from 0 to 255).
==== Examples ====
;VS(VER;ADJ)=0;
:An adjective (ADJ) may not be an specifier (VS) of a verb (VER).
;NS(NOU;DET)=255;
:Determiners (DET) are always specifiers (NS) of nouns (NOU).
==== Use ====
{|cellpadding="5" border="1" align="center"
!INPUT
!TRANSFORMATION RULES
!DISAMBIGUATION RULES
!OUTPUT
|-
|(A,B,C)(D,E,F)
|(A)(D)=X(A;D); (higher priority)<br />(A)(E)=X(E;A); (lower priority)
|X(F;A)=255;
|X(D,E,F;A,B,C)
|-
|agt(A,B,C;D,E,F)
|agt(A;D)=X(A;D); (higher priority)<br />agt(A;E)=Y(A;E); (lower priority)
|X(B;F)=0;
|Y(A,B,C;D,E,F)
|}
=== List Disambiguation Rules ===
List disambiguation rules apply over the natural language list structure to constrain the application of both Tree-to-List (TL) and List-to-List (LL) Transformation Rules. They are also used for word selection. They have the following format:
(A)(B)=P;
Where A and B are nodes, and P is an integer (from 0 to 255).
==== Examples ====
;(ART)(BLK)(VER)=0;
:An article (ART) may not precede a verb (VER).
;(ART)(BLK)(NOU)=255;
:Articles (ART) always precede nouns (NOU).
==== Use ====
{|cellpadding="5" border="1" align="center"
|+ Rule Disambiguation
!INPUT
!TRANSFORMATION RULES
!DISAMBIGUATION RULES
!OUTPUT
|-
|X(A,B,C;D,E,F)
|X(A;D)=(A)(D); (higher priority)<br />X(A;F)=(F)(A); (lower priority)
|(B)(E)=0;
|(D,E,F)(A,B,C)
|}
{|cellpadding="5" border="1" align="center"
|+ Word Disambiguation
!INPUT
!DICTIONARY
!DISAMBIGUATION RULES
!OUTPUT
|-
|the book
|[book] "22222" (POS=VER); (higher priority)<br />[book] "11111" (POS=NOU); (lower priority)
|(ART)(BLK)(VER)=0;
|[book] "1111" (POS=NOU);
|}
== Formal Syntax of Disambiguation Rules ==
Disambiguation rules must comply with the following syntax
<nowiki><DISAMBIGUATION RULE> ::= <NN RULE> | <TT RULE> | <LL RULE> </nowiki>
<nowiki><NN RULE>            ::= (<SEM>)+ "=" [0-255]";"</nowiki>
<nowiki><TT RULE>            ::= (<SYN>)+ "=" [0-255]";"</nowiki>
<nowiki><LL RULE>            ::= "(" <NODE> ")" ( "(" <NODE> ")" )+ "=" [0-255]";"</nowiki>
<nowiki><SEM>                ::= <TEXT> "(" <NODE> ";" <NODE> ")"</nowiki>
<nowiki><SYN>                ::= <TEXT> "(" <NODE> ";" <NODE> ")"</nowiki>
<nowiki><NODE>                ::= ( (<DESCRIPTION>)( "," <DESCRIPTION> )* )?</nowiki>
<nowiki><DESCRIPTION>        ::= <STRING> | <ENTRY> | <FEATURE> | <RELATION></nowiki>
<nowiki><STRING>              ::= """<text>"""</nowiki>
<nowiki><ENTRY>              ::= "["<entry>"]"</nowiki>
<nowiki><FEATURE>            ::= <VALUE> | <ATTRIBUTE> | <ATTRIBUTE>"="<VALUE></nowiki>
<nowiki><RELATION>            ::= <SEM>|<SYN></nowiki>
<nowiki><VALUE>              ::= <TEXT></nowiki>
<nowiki><ATTRIBUTE>          ::= <TEXT></nowiki>
<nowiki><TEXT>                ::= any sequence of characters except whitespace | <REGULAR EXPRESSION></nowiki>
<REGULAR EXPRESSION>  ::= "/"<[http://www.pcre.org/ PERL COMPATIBLE REGULAR EXPRESSIONS]>"/"


== Examples ==
== Examples ==
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**VS(VER;ADJ)=0; (an adjective (ADJ) may not be an specifier (VS) of a verb (VER))
**VS(VER;ADJ)=0; (an adjective (ADJ) may not be an specifier (VS) of a verb (VER))
**NS(NOU;DET)=255; (determiners (DET) are always specifiers (NS) of nouns (NOU))
**NS(NOU;DET)=255; (determiners (DET) are always specifiers (NS) of nouns (NOU))
== Further information ==
For further information on d-rules, see the [[UNL Grammar Specs]]

Revision as of 15:02, 31 May 2013

D-rules or Disambiguation rules are used to prevent wrong lexical choices, to provoke best matches and to check the consistency of graphs, trees and lists. Differently from t-rules, they do not provoke transformations, but induce or block them, by assigning priorities to natural language phenomena. The set of d-rules form the Disambiguation grammar, or D-Grammar.

Syntax

D-rules follow the general syntax (UNL Grammar Specs): 

STATEMENT=P;

Where
STATEMENT is the left side (condition) of a L-rule or a S-rule; and
P, which can range from 0 (impossible) to 255 (necessary), is the probability of occurrence of the STATEMENT

Types of Disambiguation Rules

There are three types of disambiguation rules:

  • Network disambiguation rules
  • Tree disambiguation rules
  • List disambiguation rules

Network Disambiguation Rules

Network disambiguation rules apply over the network structure of UNL graphs to constrain the application of Tree-to-Network (TN) and Network-to-Network (NN) Transformation Rules. They have the following format: 

SEM(A;B)=P;

Where SEM is a semantic relation, A and B are nodes, and P is an integer (from 0 to 255).

Examples

agt(VER;ADJ)=0;
An adjective (ADJ) may not be an agent (agt) of a verb (VER).
agt(VER;NOU)=255;
Agents (agt) of verbs (VER) are always nouns (NOU).

Use

INPUT TRANSFORMATION RULES DISAMBIGUATION RULES OUTPUT
SYN(A,B,C;D,E,F) SYN(A;D)=agt(;); (higher priority)
SYN(A;E)=aoj(;); (lower priority) 		agt(A;F)=0; aoj(A,B,C;D,E,F)

Tree Disambiguation Rules

Tree disambiguation rules apply over the intermediate tree structure to constrain the application of List-to-Tree (LT), Network-to-Tree (NT) and Tree-to-Tree (TT) Transformation Rules. They have the following format: 

SYN(A;B)=P;

Where SYN is a syntactic relation, A and B are nodes, and P is an integer (from 0 to 255).

Examples

VS(VER;ADJ)=0;
An adjective (ADJ) may not be an specifier (VS) of a verb (VER).
NS(NOU;DET)=255;
Determiners (DET) are always specifiers (NS) of nouns (NOU).

Use

INPUT TRANSFORMATION RULES DISAMBIGUATION RULES OUTPUT
(A,B,C)(D,E,F) (A)(D)=X(A;D); (higher priority)
(A)(E)=X(E;A); (lower priority) 		X(F;A)=255; X(D,E,F;A,B,C)
agt(A,B,C;D,E,F) agt(A;D)=X(A;D); (higher priority)
agt(A;E)=Y(A;E); (lower priority) 		X(B;F)=0; Y(A,B,C;D,E,F)

List Disambiguation Rules

List disambiguation rules apply over the natural language list structure to constrain the application of both Tree-to-List (TL) and List-to-List (LL) Transformation Rules. They are also used for word selection. They have the following format: 

(A)(B)=P;

Where A and B are nodes, and P is an integer (from 0 to 255).

Examples

(ART)(BLK)(VER)=0;
An article (ART) may not precede a verb (VER).
(ART)(BLK)(NOU)=255;
Articles (ART) always precede nouns (NOU).

Use

Rule Disambiguation
INPUT TRANSFORMATION RULES DISAMBIGUATION RULES OUTPUT
X(A,B,C;D,E,F) X(A;D)=(A)(D); (higher priority)
X(A;F)=(F)(A); (lower priority) 		(B)(E)=0; (D,E,F)(A,B,C)


Word Disambiguation
INPUT DICTIONARY DISAMBIGUATION RULES OUTPUT
the book [book] "22222" (POS=VER); (higher priority)
[book] "11111" (POS=NOU); (lower priority) 		(ART)(BLK)(VER)=0; [book] "1111" (POS=NOU);

Formal Syntax of Disambiguation Rules

Disambiguation rules must comply with the following syntax 

<DISAMBIGUATION RULE> ::= <NN RULE> | <TT RULE> | <LL RULE> 
<NN RULE>             ::= (<SEM>)+ "=" [0-255]";"
<TT RULE>             ::= (<SYN>)+ "=" [0-255]";"
<LL RULE>             ::= "(" <NODE> ")" ( "(" <NODE> ")" )+ "=" [0-255]";"
<SEM>                 ::= <TEXT> "(" <NODE> ";" <NODE> ")"
<SYN>                 ::= <TEXT> "(" <NODE> ";" <NODE> ")"
<NODE>                ::= ( (<DESCRIPTION>)( "," <DESCRIPTION> )* )?
<DESCRIPTION>         ::= <STRING> | <ENTRY> | <FEATURE> | <RELATION>
<STRING>              ::= """<text>"""
<ENTRY>               ::= "["<entry>"]"
<FEATURE>             ::= <VALUE> | <ATTRIBUTE> | <ATTRIBUTE>"="<VALUE>
<RELATION>            ::= <SEM>|<SYN>
<VALUE>               ::= <TEXT>
<ATTRIBUTE>           ::= <TEXT>
<TEXT>                ::= any sequence of characters except whitespace | <REGULAR EXPRESSION>
<REGULAR EXPRESSION>  ::= "/"<PERL COMPATIBLE REGULAR EXPRESSIONS>"/"

Examples

  • List structures
    • (ART)(BLK)(VER)=0; (an article (ART) may not precede a verb (VER))
    • (ART)(BLK)(NOU)=255; (articles (ART) always precede nouns (NOU))
  • Syntactic structures
    • agt(VER;ADJ)=0; (an adjective (ADJ) may not be an agent (agt) of a verb (VER))
    • agt(VER;NOU)=255; (agents (agt) of verbs (VER) are always nouns (NOU))
    • VS(VER;ADJ)=0; (an adjective (ADJ) may not be an specifier (VS) of a verb (VER))
    • NS(NOU;DET)=255; (determiners (DET) are always specifiers (NS) of nouns (NOU))
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