Document conversion system, document conversion method and computer readable recording medium storing document conversion program

• US 20030093760A1
• Filed: 11/12/2002
• Published: 05/15/2003
• Est. Priority Date: 11/12/2001
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ishikawa, Norihiro, Kato, Takeshi, Ueno, Hidetoshi, Suzuki, Hideharu, Sumino, Hiromitsu
• Granted Patent: US 7,139,975 B2
• Time in Patent Office: Days
• US Class Current: 715/236
• CPC Class Codes: G06F 40/143 Markup, e.g. Standard Generalized Markup Language [SGML] or Document Type Definition [DTD]
• CPC Class Codes: G06F 40/154 Tree transformation for tree-structured or markup documents, e.g. XSLT, XSL-FO or stylesheets
• CPC Class Codes: G06F 40/16 Automatic learning of transformation rules, e.g. from examples

Abstract

This invention aims at reducing an total time required for document conversion by outputting an appropriate document data which matches a document type definition after conversion so as to omit a validity verification step in the document structure conversion.

Specifically, this invention provides a document conversion method for converting a first structured document F1, formed based on a first document type definition D1, to a second structured document F3, formed based on a second document type definition D2, the document conversion method comprises analyzing the document type definition D1 and document type definition D2 and extracting a different document type definition, generating a conversion template T2 described therein a conversion rule which prevents the structured document F3, which is the result of document conversion process, from being contradictory to the document type definition D2, based on the results of the analysis, and performing document conversion process using the conversion template T2.

Claims

1. A document conversion system for converting a first structured document formed based on a first document schema into a second structured document formed based on a second document schema, the document conversion system comprising:

a document type definition analyzer for analyzing the first document schema and the second document schema and extracting a different document type definition;

a conversion template generator for generating a conversion template having described therein a conversion rule which prevents the second structured document, which is the result of a document conversion process, from being contradictory to the second document schema, based on the results of the analysis performed by the document type definition analyzer; and

a document structure converter for performing document conversion process using the conversion template.

2. The document conversion system according to claim 1, wherein the first document schema and the second document schema each have an identifier for defining the logical structure of a character string constituting a document,

the document type definition analyzer comprises:

an identifier correspondence table storing unit for storing an identifier correspondence table which makes a correspondence between the identifier of the first document schema and the identifier of the second document schema;

a logical structure extracting unit for extracting a first logical structure defined by the identifier of the first document schema and a second logical structure defined by the identifier of the second document schema; and

a condition detector for detecting that portions differ between the first logical structure and the second logical structure by comparing both structures according to the identifier correspondence table and analyzing conditions generated by the detected differing portions, and

the conversion template generator which generates a conversion rule based on the condition of the detected differing portions and their corresponding second logical structure.

3. The document conversion system according to claim 1 further comprising a file recorder for storing the first structured document and the second structured document as file data, wherein the document structure converter converts the first structured document read out from the file recorder.

4. The document conversion system according to claim 1 further comprising:

a receiver which is connected to communication network for acquiring a conversion request and the first structured document from the communication network; and

a transmitter for transmitting the second structured document converted by the document structure converter to the communication network.

5. The document conversion system according to claim 1 further comprising a shaper for correcting errors in the description of the first structured document so that the first structured document can be read by the document structure converter.

6. A document conversion method for converting a first structured document formed based on a first document schema into a second structured document formed based on a second document schema, the document conversion method comprising the steps of:

(A) analyzing the first document schema and the second document schema and extracting a different document type definition;

(B) generating a conversion template having described therein a conversion rule which prevents the second structured document, which is the result of a document conversion process, from being contradictory to the second document schema, based on the results of the analysis; and

(C) performing document conversion process using the conversion template.

7. The document conversion method according to claim 6, wherein the first document schema and the second document schema each have an identifier for defining the logical structure of a character string constituting a document,

the step (A) comprises the steps of:

(A-1) extracting a first logical structure defined by the identifier of the first document schema and a second logical structure defined by the identifier of the second document schema;

(A-2) detecting portions that differ between the first logical structure and the second logical structure by comparing both structures according to an identifier correspondence table which makes a correspondence between the identifier of the first document schema and the identifier of the second document type; and

(A-3) analyzing conditions which are generated by the detected differing portions, and

the step (B) is for generating a conversion rule based on the condition of the detected differing portions and their corresponding second logical structure.

8. The document conversion method according to claim 6, wherein the first structured document and the second structured document are stored in a file recorder as file data, and

the step (C) is for converting the first structured document read from the file recorder.

9. The document conversion method according to claim 6 further comprising:

a step of acquiring a conversion request and the first structured document from communication network, and

a step of transmitting a converted second structured document to the communication network in the step (C).

10. The document conversion method according to claim 6, wherein the step (C) includes a step of correcting errors in the description of the first structured document so that the first structured document can be read.

11. A computer readable recording medium storing a document conversion program which converts a first structured document formed based on a first document schema into a second structured document formed based on a second document schema and makes a computer to execute a process comprising the steps of:

(A) analyzing the first document schema and the second document schema and extracting a different document type definition;

(B) generating a conversion template having described therein a conversion rule which prevents the second structured document, which is the result of a document conversion process, from being contradictory to the second document schema, based on the results of the analysis; and

(C) performing document conversion process using the conversion template.

12. The computer readable recording medium storing the document conversion program according to claim 11, wherein the first document schema and the second document schema each have an identifier for defining the logical structure of a character string constituting a document,

the step (A) comprises the steps of:

(A-1) extracting a first logical structure defined by the identifier of the first document schema and a second logical structure defined by the identifier of the second document schema;

(A-2) detecting portions that differ between the first logical structure and the second logical structure by comparing both structures according to an identifier correspondence table which makes a correspondence between the identifier of the first document schema and the identifier of the second document schema; and

(A-3) analyzing conditions which are generated by the detected differing portions, and

the step (B) is for generating the conversion rule based on the condition of the detected differing portions and their corresponding second logical structure.

13. The computer readable recording medium storing the document conversion program according to claim 11, wherein the first structured document and the second structured document are stored in a file recorder as file data, and

the step (C) is for converting the first structured document read from the file recorder.

14. The computer readable recording medium storing the document conversion program according to claim 11 further comprising:

a step of acquiring a conversion request and the first structured document from communication network, and

a step of transmitting a converted second structured document to the communication network in the step (C).

15. The computer readable recording medium storing the document conversion program according to claim 11, wherein the step (C) includes a step of correcting errors in the description of the first structured document so that the first structured document can be read.