SYSTEMS AND METHODS FOR CONTENT EXTRACTION

• US 20130326332A1
• Filed: 05/23/2013
• Published: 12/05/2013
• Est. Priority Date: 03/30/2005
• Status: Active Grant

• Current Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Original Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Inventors: Kaiser, Gail, Stolfo, Salvatore J., Gupta, Suhit
• Granted Patent: US 9,372,838 B2
• Time in Patent Office: Days
• US Class Current: 715/234
• CPC Class Codes: G06F 16/80 of semi-structured data, e.g. markup language structured data such as SGML, XML or HTML content-based retrieval of web data G06F16/95
• CPC Class Codes: G06F 16/84 Mapping; Conversion
• CPC Class Codes: G06F 16/951 Indexing; Web crawling techniques
• CPC Class Codes: G06F 40/143 Markup, e.g. Standard Generalized Markup Language [SGML] or Document Type Definition [DTD]

Abstract

Systems and methods are presented for content extraction from markup language text. The content extraction process may parse markup language text into a hierarchical data model and then apply one or more filters. Output filters may be used to make the process more versatile. The operation of the content extraction process and the one or more filters may be controlled by one or more settings set by a user, or automatically by a classifier. The classifier may automatically enter settings by classifying markup language text and entering settings based on this classification. Automatic classification may be performed by clustering unclassified markup language texts with previously classified markup language texts.

Claims

1. A method for automatically classifying a markup language text that is accessible at an Internet domain comprising:

(a) retrieving from one or more data repositories, data associated with the Internet domain;

(b) computing a first identifier for the Internet domain based on at least the data associated with the Internet domain and the markup language text;

(c) computing a measure of similarity between the computed first identifier and each of a first plurality of previously classified identifiers; and

(d) assigning the markup language text a classification based on the computed measure of similarity between the computed first identifier and each of the first plurality of previously classified identifiers.

2. The method of claim 1, wherein the classification assigned to the markup language text is the same classification as that of the previously classified identifier with the best measure of similarity to the computed first identifier.

3. The method of claim 1, wherein the classification assigned to the markup language text is a new classification.

4. The method of claim 1, wherein the one or more data repositories are search engines and the data associated with the Internet domain is a search result.

5. The method of claim 1, wherein computing the first identifier comprises computing, for each of a plurality of words in a predetermined set of words, a frequency of each word in the markup language text and the search result.

6. The method of claim 5, wherein the predetermined set of words are generated by:

(a) retrieving markup language text from an Internet domain;

(b) retrieving search results associated with the Internet domain from one or more search engines;

(c) computing a frequency for each of a plurality of words in the search results and the markup language text; and

(d) adding to the predetermined set of words each of the plurality of words whose frequency is greater than a threshold.

7. The method of claim 6, further comprising adding to the predetermined set of words each of the plurality of words whose frequency is one.

8. The method of claim 1, wherein computing the measure of similarity comprises computing the Manhattan distance between the computed first identifiers and each of the first plurality of previously classified and previously computed identifiers.

9. The method of claim 1, further comprising retrieving settings for a filter based on the classification assigned to the markup language text.

10. The method of claim 1, further comprising:

(a) computing a second identifier for the markup language text based on the layout of the markup language text;

(b) computing a measure of similarity between the second identifier and each of a second plurality of previously classified identifiers; and

(c) assigning the markup language text a classification based on both the first identifier and the second identifier.