Method and device for creating an index

1. A method for creating an index, comprising:

dividing a document into a plurality of regions;

determining the number of times that a token appears in the plurality of regions, the token including at least one character in the document;

assigning respective weights to the plurality of regions; and

creating an inverted document linked list directed to the token based on the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions, wherein the inverted document linked list directed to the token contains the weights assigned to the plurality of regions, at least in part by creating a token position list for the token, the token position list including at least one position where the token appears in the document and at least one of the weights corresponding thereto, wherein the at least one weight is stored into a payload field of the token position list.

2. The method according to claim 1 , wherein dividing a document into a plurality of regions comprises:

dividing, based on a structure of the document, the document into a plurality of regions selected from a group consisting of a title, an abstract, one or more keywords, a text, and/or one or more references.

3. The method according to claim 1 , wherein assigning respective weights to the plurality of regions comprises:

assigning the respective weights to the plurality of regions based on relevance of the plurality of regions to the document.

4. The method according to claim 1 , wherein creating an inverted document linked list directed to the token comprises:

creating the inverted document linked list directed to the token by accumulating the at least one weight.

5. The method according to claim 1 , wherein creating an inverted document linked list directed to the token comprises:

creating a token position list for the plurality of regions, the token position list including at least one position where the token appears in the plurality of regions; and

creating the inverted document linked list directed to the token by accumulating respective products of the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions.

6. The method according to claim 1 , further comprising:

modifying at least one of the respective weights assigned to the plurality of regions.

7. The method of claim 1 , wherein creating the inverted document linked list directed to the token further comprises creating a separate token position list for each one of the weights assigned to the plurality of regions.

8. A device for creating an index, comprising:

at least one processing unit; and

at least one memory, being coupled to the at least one processing unit and storing machine-executable instructions which, when being executed by the at least processing unit, cause the device to perform acts of:

dividing a document into a plurality of regions;

determining the number of times that a token appears in the plurality of regions, the token including at least one character in the document;

assigning respective weights to the plurality of regions; and

creating an inverted document linked list directed to the token based on the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions, wherein the inverted document linked list directed to the token contains the weights assigned to the plurality of regions, at least in part by creating a token position list for the token, the token position list including at least one position where the token appears in the document and at least one of the weights corresponding thereto, wherein the at least one weight is stored into a payload field of the token position list.

9. The device according to claim 8 , wherein dividing a document into a plurality of regions comprises:

dividing, based on a structure of the document, the document into a plurality of regions selected from a group consisting of a title, an abstract, one or more keywords, a text, and/or one or more references.

10. The device according to claim 8 , wherein assigning respective weights to the plurality of regions comprises:

assigning the respective weights to the plurality of regions based on relevance of the plurality of regions to the document.

11. The device according to claim 8 , wherein creating an inverted document linked list directed to the token comprises:

creating the inverted document linked list directed to the token by accumulating the at least one weight.

12. The device according to claim 8 , wherein creating an inverted document linked list directed to the token comprises:

creating a token position list for the plurality of regions, the token position list including at least one position where the token appears in the plurality of regions; and

creating the inverted document linked list directed to the token by accumulating respective products of the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions.

13. The device according to claim 8 , wherein the instructions, when being executed by the at least one processing unit, causes the device to:

modifying at least one of the respective weights assigned to the plurality of regions.

14. A computer program product for creating an index, the computer program product comprising:

a non-transitory computer readable medium encoded with computer-executable code, the code configured to enable the execution of:

dividing a document into a plurality of regions;

determining the number of times that a token appears in the plurality of regions, the token including at least one character in the document;

assigning respective weights to the plurality of regions; and

creating an inverted document linked list directed to the token based on the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions, wherein the inverted document linked list directed to the token contains the weights assigned to the plurality of regions, at least in part by creating a token position list for the token, the token position list including at least one position where the token appears in the document and at least one of the weights corresponding thereto, wherein the at least one weight is stored into a payload field of the token position list.

15. The Computer program product of claim 14 , wherein dividing a document into a plurality of regions comprises:

dividing, based on a structure of the document, the document into a plurality of regions selected from a group consisting of a title, an abstract, one or more keywords, a text, and/or one or more references.

16. The computer program product of claim 14 wherein assigning respective weights to the plurality of regions comprises:

assigning the respective weights to the plurality of regions based on relevance of the plurality of regions to the document.

17. The computer program product of claim 14 , wherein creating an inverted document linked list directed to the token comprises:

creating the inverted document linked list directed to the token by accumulating the at least one weight.

18. The computer program product of claim 14 , wherein creating an inverted document linked list directed to the token comprises:

creating a token position list for the plurality of regions, the token position list including at least one position where the token appears in the plurality of regions; and

creating the inverted document linked list directed to the token by accumulating respective products of the number of times that the token appears in the plurality of regions and the respective weights of the plurality of regions.