CA2546896A1 - Extraction of facts from text - Google Patents

Extraction of facts from text Download PDF

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Publication number
CA2546896A1
CA2546896A1 CA002546896A CA2546896A CA2546896A1 CA 2546896 A1 CA2546896 A1 CA 2546896A1 CA 002546896 A CA002546896 A CA 002546896A CA 2546896 A CA2546896 A CA 2546896A CA 2546896 A1 CA2546896 A1 CA 2546896A1
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CA
Canada
Prior art keywords
text
attributes
base
patterns
tokens
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002546896A
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French (fr)
Other versions
CA2546896C (en
Inventor
Mark Wasson
James Wiltshire, Jr.
Donald Loritz
Steve Xu
Shian-Jung Chen
Valentina Templar
Eleni Koutsomitopoulou
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LexisNexis Inc
Original Assignee
Lexisnexis, A Division Of Reed Elsevier Inc.
Mark Wasson
James Wiltshire, Jr.
Donald Loritz
Steve Xu
Shian-Jung Chen
Valentina Templar
Eleni Koutsomitopoulou
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Application filed by Lexisnexis, A Division Of Reed Elsevier Inc., Mark Wasson, James Wiltshire, Jr., Donald Loritz, Steve Xu, Shian-Jung Chen, Valentina Templar, Eleni Koutsomitopoulou filed Critical Lexisnexis, A Division Of Reed Elsevier Inc.
Publication of CA2546896A1 publication Critical patent/CA2546896A1/en
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Publication of CA2546896C publication Critical patent/CA2546896C/en
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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F40/00—Handling natural language data
    • G06F40/20—Natural language analysis
    • G06F40/279—Recognition of textual entities
    • G06F40/289—Phrasal analysis, e.g. finite state techniques or chunking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
    • G06F16/31—Indexing; Data structures therefor; Storage structures
    • G06F16/313—Selection or weighting of terms for indexing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/30—Information retrieval; Database structures therefor; File system structures therefor of unstructured textual data
    • G06F16/36—Creation of semantic tools, e.g. ontology or thesauri
    • G06F16/367—Ontology
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F40/00—Handling natural language data
    • G06F40/10—Text processing
    • G06F40/166—Editing, e.g. inserting or deleting
    • G06F40/169—Annotation, e.g. comment data or footnotes

Abstract

A fact extraction tool set ("FEX") finds and extracts targeted pieces of information from text using linguistic and pattern matching technologies, and in particular, text annotation and fact extraction. Text annotation tools break a text, such as a document, into its base tokens and annotate those tokens or patterns of tokens with orthographic, syntactic, semantic, pragmatic and other attributes. A user-defined "Annotation Configuration" controls which annotation tools are used in a given application. XML is used as the basis for representing the annotated text. A tag uncrossing tool resolves conflicting (crossed) annotation boundaries in an annotated text to produce well-formed XML from the results of the individual annotators. The fact extraction tool is a pattern matching language which is used to write scripts that find and match patterns of attributes that correspond to targeted pieces of information in the text, and extract that information.

Claims (55)

1. A fact extraction tool set for extracting information from a document, comprising:
means for annotating a text; and means for extracting facts from the annotated text.
2. The fact extraction tool set of claim 1, wherein the means for annotating a text comprises means for assigning syntactic and semantic attributes to a text passage by at least one of parsing the text passage and applying text annotation processes other than parsing the text passage.
3. The fact extraction tool set of claim 2, wherein the means for assigning syntactic and semantic attributes to a text passage comprises means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens with a number of orthographic, syntactic, semantic, pragmatic and dictionary-based attributes.
4. The fact extraction tool set of claim 3, wherein the attributes include tokenization, text normalization, part of speech tags, sentence boundaries, parse trees, semantic attribute tagging and other interesting attributes of the text.
5. The fact extraction tool set of claim 2, wherein the means for assigning syntactic and semantic attributes to a text passage comprises independent annotators.
6. The fact extraction tool set of claim 5, wherein the independent annotators use XML as a basis for representing annotated text.
7. The fact extraction tool set of claim 6, further comprising means for resolving conflicting annotation boundaries in the annotated text to produce well-formed XML from the results of independent annotators.
8. The fact extraction tool set of claim 3, wherein the means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens comprises independent annotators, wherein the annotators are of three types comprising:
token attributes, which have a one-per-base-token alignment, where for the attribute type represented, there is an attempt to assign an attribute to each base token;
constituent attributes assigned yes-no values to patterns of base tokens, where the entire pattern is considered to be a single constituent with respect to some annotation value; and links, which assign common identifiers to coreferring and other related patterns of base tokens.
9. The fact extraction tool set of claim 3, wherein the means for annotating a text further comprises means for associating all annotations assigned to a particular piece of text with the base tokens for that text to generate aligned annotations.
10. The fact extraction tool set of claim 9, wherein the means for extracting facts comprises means for identifying and extracting potentially interesting pieces of information in the aligned annotations by finding patterns in the attributes stored by the annotators.
11. The fact extraction tool set of claim 10, wherein the means for identifying and extracting potentially interesting pieces of information comprises means for recognizing both true left and right constituent attributes and non-contiguous constituent attributes.
12. The fact extraction tool set of claim 10, wherein the means for identifying and extracting potentially interesting pieces of information comprises at least one text pattern recognition rule written in a rule-based information extraction language, wherein the at least one text pattern recognition rule queries for at least one of literal text, attributes, and relationships found in the aligned annotations to define the facts to be extracted.
13. The fact extraction tool set of claim 12, wherein the at least one text pattern recognition rule can use regular expression functionality, XPath-based functionality, and auxiliary definitions in any combination.
14. The fact extraction tool set of claim 12, wherein the at least one text pattern recognition rule comprises a pattern that describes te text of interest, a label that names the pattern for testing and debugging purposes; and an action that indicates what should be done in response to a successful match.
15. The fact extraction tool set of claim 12, wherein the means for identifying and extracting potentially interesting pieces of information further comprises at least one auxiliary definition statement used to name and define a fragment of a pattern.
16. A rule-based information extraction language for use in identifying and extracting potentially interesting pieces of information in aligned annotations in a text, comprising at least one text pattern recognition rule that queries for at least one of literal text, attributes, and relationships found in the aligned annotations to define the facts to be extracted.
17. The language of claim 16, wherein the at least one text pattern recognition rule can use regular expression functionality, XPath-based functionality, and auxiliary definitions in any combination.
18. The language of claim 16, wherein the at least one text pattern recognition rule comprises a pattern that describes the text of interest, a label that names the pattern for testing and debugging purposes, and an action that indicates what should be done in response to a successful match.
19. The language of claim 16, further comprising at least one auxiliary definition statement used to name and define a fragment of a pattern.
20. A text annotation tool comprising:
means for assigning syntactic and semantic attributes to a text passage by at least one of parsing the text passage and applying text annotation processes other than parsing the text passage, including means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens with a number of orthographic, syntactic, semantic, pragmatic and dictionary-based attributes; and means for associating all annotations assigned to a particular piece of text with the base tokens for that text to generate aligned annotations.
21. The text annotation tool of claim 20, wherein the attributes include tokenization, text normalization, part of speech tags, sentence boundaries, parse trees, semantic attribute tagging and other interesting attributes of the text.
22. The text annotation tool of claim 20, wherein the means for assigning syntactic and semantic attributes to a text passage comprises independent annotators.
23. The text annotation tool of claim 22, wherein the independent annotators use XML as a basis for representing annotated text.
24. The text annotation tool of claim 23, further comprising means for resolving conflicting annotation boundaries in the annotated text to produce well-formed XML from the results of independent annotators.
25. The text annotation tool of claim 20, wherein the means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens comprises independent annotators, wherein the annotators are of three types comprising:
token attributes, .which have a one-per-base-token alignment, where for the attribute type represented, there is an attempt to assign an attribute to each base token;
constituent attributes assigned yes-no values to patterns of base tokens, where the entire pattern is considered to be a single constituent with respect to some annotation value; and links, which assign common identifiers to coreferring and other related patterns of base tokens.
26. A computer program product for extracting information from a document, the computer program product comprising a computer usable storage medium having computer readable program code means embodied in the medium, the computer readable program code means comprising:
computer readable program code means for annotating a text; and computer readable program code means for extracting facts from the annotated text.
27. The computer program product of claim 26, wherein the computer readable program code means for annotating a text comprises computer readable program code means for assigning syntactic and semantic attributes to a text passage by at least one of parsing the text passage and applying text annotation processes other than parsing the text passage.
28. The computer program product of claim 27, wherein the computer readable program code means for assigning syntactic and semantic attributes to a text passage comprises computer readable program code means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens with a number of orthographic, syntactic, semantic, pragmatic and dictionary-based attributes.
29. The computer program product of claim 28, wherein the attributes include tokenization, text normalization, part of speech tags, sentence boundaries, parse trees, semantic attribute tagging and other interesting attributes of the text.
30. The computer program product of claim 27, wherein the computer readable program code means for assigning syntactic and semantic attributes to a text passage comprises independent annotators.
31. The computer program product of claim 30, wherein the independent annotators use XML as a basis for representing annotated text.
32. The computer program product of claim 31, further comprising computer readable program code means for resolving conflicting annotation boundaries in the annotated text to produce well-formed XML from the results of independent annotators.
33. The computer program product of claim 28, wherein the computer readable program code means for breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens comprises individual annotators, wherein the annotators are of three types comprising:
token attributes, which have a one-per-base-token alignment, where for the attribute type represented, there is an attempt to assign an attribute to each base token;
constituent attributes assigned yes-no values to patterns of base tokens, where the entire pattern is considered to be a single constituent with respect to some annotation value; and links, which assign common identifiers to coreferring and other related patterns of base tokens.
34. The computer program product of claim 28, wherein the computer readable program code means for annotating a text further comprises computer readable program code means for associating all annotations assigned to a particular piece of text with the base tokens for that text to generate aligned annotations.
35. The computer program product of claim 34, wherein the computer readable program code means for extracting facts comprises computer readable program code means for identifying and extracting potentially interesting pieces of information in the aligned annotations by finding patterns in the attributes stored by the annotators.
36. The computer program product of claim 35, wherein the computer readable program code means for identifying and extracting potentially interesting pieces of information further comprises computer readable program code means for recognizing both true left and right constituent attributes and non-contiguous constituent attributes.
37. The computer program product of claim 35, wherein the computer readable program code means for identifying and extracting potentially interesting pieces of information comprises at least one text pattern recognition rule written in a rule-based information extraction language, wherein the at least one text pattern recognition rule queries for at least one of literal text, attributes, and relationships found in the aligned annotations to define the facts to be extracted.
38. The computer program product of claim 37, wherein the at least one text pattern recognition rule can use regular expression functionality, XPath-based functionality, and auxiliary definitions in any combination.
39. The computer program product of claim 37, wherein the at least one text pattern recognition rule comprises a pattern that describes the text of interest, a label that names the pattern for testing and debugging purposes, and an action that indicates what should be done in response to a successful match.
40. The computer program product of claim 37, wherein the computer readable program code means for identifying and extracting potentially interesting pieces of information further comprises at least one auxiliary definition statement used to name and define a fragment of a pattern.
41. A method of extracting information from a document, comprising the steps of:
annotating a text; and extracting facts from the annotated text.
42. The method of claim 41, wherein the step of annotating a text comprises assigning syntactic and semantic attributes to a text passage by at least one of parsing the text passage and applying text annotation processes other than parsing the text passage.
43. The method of claim 42, wherein the parsing of the text passage comprises breaking it into its base tokens and annotating the base tokens and patterns of base tokens with a number of orthographic, syntactic, semantic, pragmatic and dictionary-based attributes.
44. The method of claim 43, wherein the attributes include tokenization, text normalization, part of speech tags, sentence boundaries, parse trees, semantic attribute tagging and other interesting attributes of the text.
45. The method of claim 42, wherein the parsing of the text passage is carried out by independent annotators.
46. The method of claim 45, wherein the individual annotators use XML as a basis for representing annotated text.
47. The method of claim 46, further comprising the step of resolving conflicting annotation boundaries in the annotated text to produce well-formed XML from the results of independent annotators.
48. The method of claim 43, wherein the step of breaking the text passage into its base tokens and annotating the base tokens and patterns of base tokens is carried out using independent annotators, wherein the annotators are of three types comprising:
token attributes, which have a one-per-base-token alignment, where for the attribute type represented, there is an attempt to assign an attribute to each base token;
constituent attributes assigned yes-no values to patterns of base tokens, where the entire pattern is considered to be a single constituent with respect to some annotation value; and links, which assign common identifiers to coreferring and other related patterns of base tokens.
49. The method of claim 43, wherein the step of annotating a text further comprises the step of associating all annotations assigned to a particular piece of text with the base tokens for that text to generate aligned annotations.
50. The method of claim 49, wherein the step of extracting facts comprises identifying and extracting potentially interesting pieces of information in the aligned annotations by finding patterns in the attributes stored by the annotators.
51. The method of claim 50, wherein the step of identifying and extracting potentially interesting pieces of information comprises recognizing both true left and right constituent attributes and non-contiguous constituent attributes.
52. The method of claim 50, wherein the patterns are found using at least one text pattern recognition rule written in a rule-based information extraction language, wherein the at least one text pattern recognition rule queries for at least one of literal text, attributes, and relationships found in the aligned annotations to define the facts to be extracted.
53. The method of claim 52, wherein the at least one text pattern recognition rule can use regular expression functionality, XPath-based functionality, and auxiliary definitions in any combination.
54. The method of claim 52, wherein the at least one text pattern recognition rule describes the text of interest, names the pattern for testing and debugging purposes; and indicates what should be done in response to a successful match.
55. The method of claim 52, wherein the patterns are found further using at least one auxiliary definition statement used to name and define a fragment of a pattern.
CA2546896A 2003-11-19 2004-10-26 Extraction of facts from text Active CA2546896C (en)

Applications Claiming Priority (3)

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US10/716,202 US20050108630A1 (en) 2003-11-19 2003-11-19 Extraction of facts from text
US10/716,202 2003-11-19
PCT/US2004/035359 WO2005052727A2 (en) 2003-11-19 2004-10-26 Extraction of facts from text

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CA2546896A1 true CA2546896A1 (en) 2005-06-09
CA2546896C CA2546896C (en) 2012-08-07

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EP (1) EP1695170A4 (en)
AU (1) AU2004294094B2 (en)
CA (1) CA2546896C (en)
NZ (1) NZ547871A (en)
WO (1) WO2005052727A2 (en)

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