WO1999053676A1 - Method of using a natural language interface to retrieve information from one or more data resources - Google Patents
Method of using a natural language interface to retrieve information from one or more data resources Download PDFInfo
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- WO1999053676A1 WO1999053676A1 PCT/US1999/007278 US9907278W WO9953676A1 WO 1999053676 A1 WO1999053676 A1 WO 1999053676A1 US 9907278 W US9907278 W US 9907278W WO 9953676 A1 WO9953676 A1 WO 9953676A1
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- WIPO (PCT)
- Prior art keywords
- information
- query
- natural language
- telephone number
- language query
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/487—Arrangements for providing information services, e.g. recorded voice services or time announcements
- H04M3/493—Interactive information services, e.g. directory enquiries ; Arrangements therefor, e.g. interactive voice response [IVR] systems or voice portals
- H04M3/4931—Directory assistance systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
- H04M2201/40—Electronic components, circuits, software, systems or apparatus used in telephone systems using speech recognition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/912—Applications of a database
- Y10S707/913—Multimedia
- Y10S707/916—Audio
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/912—Applications of a database
- Y10S707/917—Text
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/953—Organization of data
- Y10S707/955—Object-oriented
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
- Y10S707/99934—Query formulation, input preparation, or translation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
- Y10S707/99935—Query augmenting and refining, e.g. inexact access
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99941—Database schema or data structure
- Y10S707/99943—Generating database or data structure, e.g. via user interface
Definitions
- the invention relates to a method for using a natural language query for retrieving information from one or more data resources and, more particularly, a method for using a natural language query for automatically retrieving and configuring a destination telephone number from existing data resources and using the destination telephone number to place a telephone call.
- Files or other resources on computers around the world may be publicly available to users of other computers through the collection of networks known as the Internet.
- the collection of all such publicly available resources, linked together using files written in Hypertext Mark-up Language (“HTML”) is known as the World Wide Web (“web”).
- HTML Hypertext Mark-up Language
- a user of a computer that is connected to the Internet may cause a program known as a client to request resources that are part of the web. Server programs then process the requests to return the specified resources.
- a standard naming convention has been adopted, known as a Uniform Resource Locator ("URL"). This convention encompasses several types of location names, presently including subclasses such as Hypertext Transport Protocol (“http”), File Transport Protocol (“ftp”), gopher and Wide Area Information Service (“WAIS").
- the various resources accessible via the web are created and maintained by many different people on servers located all around the world, and may be created for many different purposes.
- Many individuals and businesses now have their own web sites that can be visited by people "surfing" the web. These web sites typically provide information on a myriad of subjects such as sports, business, news and 2 even community events.
- web sites which provide useful information about a particular business establishment such as office locations, customer service telephone numbers and information about the products and/or services that the business offers to the consumer.
- an individual accessing such a web site is looking for particular information such as information about a particular product. However, the individual might desire additional information about the particular product, which is not available from the web site.
- the individual will place a telephone call to the customer service department of the business entity to obtain the additional information.
- the individual may want to know if an electronics store carries a particular product, such as a particular brand name television and the price of the television. Such information may not be contained in the web site and the individual may have to call the electronics store to receive the desired information.
- This multiple step process of searching and retrieving information from the Internet and then using a conventional phone line to call the business establishment for still more information or conducting business is cumbersome and time consuming.
- the individual may generally know the location of a particular establishment, but may not know the exact address or the name of the establishment. For example, an individual may know that there is an electronics store in their town on Route 4, but may not know the name of the electronics store. The individual may access a web site that contains information about the particular town to try to identify the exact name and location of the electronics store.
- Conventional searching techniques require a hierarchical step by step query approach to locate the desired information. For example, the individual may enter the address of the store, if known, or the type of store to get a listing of relevant information. However, such searching may require many steps and, in many instances, the available search queries may not be compatible with the known information. As such, the searching many require additional unnecessary search queries in order to obtain the desired information. Summary of the Invention
- a method of using at least one natural language query to retrieve information from one or more data resources and further performing a requested action using the retrieved information is disclosed.
- At least one natural language query directed to retrieving particular information is received.
- At least one object from the natural language query is extracted.
- the relationship between each of the at least one extracted objects is determined.
- a semantic representation is created from the at least one extracted objects.
- a database query is generated based on the semantic representation using a pre- defined knowledge structure. The query is applied to one or more of the data resources and information is retrieved. The requested action is then performed using the retrieved information.
- the information retrieved is a telephone number for a particular destination and the requested action is the placement of a telephone call using the retrieved telephone number.
- the requested information is retrieved by querying multiple data resources in which each data resource contains a different type of information. Objects are extracted from the natural language query which correspond to different types of information. Each information type is associated with a particular data resource. A query is generated for each object and applied to the corresponding data resource. The retrieved information may be integrated into a query to a different data resource to retrieve additional information. The retrieved information may be used to perform a requested action such as the placement of a telephone call.
- FIG. 1 is a simplified diagram of an exemplary system embodying the invention
- FIGs. 2a and 2b are flow charts illustrating the implementation of a query by the system of FIG. 1;
- FIG. 3 is a flow chart illustrating the creation of a knowledge structure from a natural language query.
- FIG. 1 is a simplified diagram of an exemplary system 100 embodying the invention.
- a user desires to establish a real-time connection to a particular establishment 130 (e.g., a telephone call to a representative of the establishment 130) by extracting relevant information from one or more data resources.
- the data resources are web sites identified by a particular URL. It is to be understood by those skilled in the art that the data resources can be any type of data file that may be accessed by the user over a packet network 108.
- a user Using a personal computer (PC) 102, a user establishes a connection with packet network 108 via an access server 106.
- the user may also use a telephone 103 to connect to the packet network 108.
- a modem connection (not shown) may be used to connect the PC 102 to the packet network 108 in a conventional manner.
- the packet network 108 can be, for example, the Internet or an Intranet.
- the packet network 108 may comprise a single packet network or a multiplicity of packet networks, such as, e.g., the "backbone" networks comprising the Internet.
- the access server 106 may illustratively, be a server connected to the Internet provided by, e.g., an Internet service provider, or may be any other server used for providing access to the packet network 108.
- the packet network 108 is connected to a plurality of information servers 110 which host a plurality of information services or web sites.
- An information server 110 includes grammars that represent the language (written or spoken) used by customers for accessing the information related to that particular service or site. 5
- the information server 110 When the information server 110 receives a natural language query, the information server 110 transmits the natural language query and the corresponding grammar to a service host 112 in a predefined protocol that characterizes the service host.
- the service host 112 can communicate with a plurality of information servers, each one of them representing a particular service or site. Any information server that complies with the protocol defined by a service host can use the services provided by that service host.
- the service host 112 coordinates with the information server 110, the associated data resources, and the natural language (NL) server 114 to process the natural language query.
- the service host 112 sends the natural language query and the specific grammars provided by the information server 110 to the NL server 114.
- the NL server 114 parses the natural language query and sends the resulting semantic tags to the service host 112.
- the service host 112 uses ad-hoc transducers (a.k.a knowledge structures) to convert semantic tags into search queries (e.g. SQL queries) for each particular data resource.
- the knowledge structures are stored in the databases 118(a-n).
- the search query is used to access data resources contained in, typically, a plurality of destination servers 116. It is to be understood by those skilled in the art that more than one data resource may be accessed from a single destination server, or alternatively, multiple data resources contained in different destination servers may be accessed at the same time. These destination servers may be dedicated to the particular service host and/or publicly available and accessed through the packet network 108 (not shown in Figure 1).
- An example of a search query that may be generated is a request for a telephone number corresponding to a particular establishment.
- call connection can be provided by a standard telecom adjunct at the service host 112 i.e., the call to the 6 telephone 122 of the establishment 130 is initiated.
- a connection is established with the called party (e.g., the establishment 130) a direct connection is established between the user and the called party (e.g., employee of establishment).
- the user can connect to the establishment's facsimile machine 124 or personal computer 126.
- FIGs. 2a and 2b A more detailed example of how the present invention may be implemented is set forth in FIGs. 2a and 2b.
- a user may access a particular data resource such as a directory for the town of Westfield by inputting the URL http://www.westfield.com (step 202).
- the URL for that Westfield data resource is inputted into PC 102 either by typing the request using a keyboard 104 or by speaking the request into a microphone 105.
- the information server 110 can be directly accessed through a telephone 103: (1) an internet telephone connected to the access server (2) a conventional PSTN telephone connected to the information server assuming that the information server has a telecom adjunct and the capability of processing spoken requests.
- Spoken requests either from a PC microphone 105 or from a telephone 103 can be handled by a speech recognition system residing at the information server.
- the PC 102 dials into an access server 106 that is connected to the Internet or other database service via a logical network interface (not shown).
- the logical network interface may be a local area network (LAN), a Serial Line Internet
- SLIP Session Initiation Protocol
- the information server that is accessed can either be a specific web site, such as, but not limited to the web site of a company, or a dedicated information resource web site.
- the dedicated information resource web site can be, for example, a single web site or a combination of web sites which contains a significant amount of general reference information which relates to a particular 7 subject matter, such as a national directory of movie information.
- a web site can also be dedicated to handle a particular subject matter.
- a web site can contain movie and theater information for all movie theaters in the United States.
- the information server to be accessed may be characterized by a URL and/or a telephone number.
- the user can send a text or a spoken query requesting a particular action or service (step 204), for example: "call the pizza place on Main Street in Westfield".
- the query is received by the access server 106 and the natural language query is sent to the information server 110 via packet network 108.
- the packet network 108 may be connected to a plurality of information servers which each relate to one or more particular information services, or there may be a single centralized information server 110 which is accessed by all information services which are capable of receiving and processing natural language queries.
- the information server 110 is preferably located in one or more adjunct servers.
- Each information server 110 contains at least some of the data resources (e.g., URLs and associated site/service-specific grammars) capable of receiving and responding to a natural language query.
- Information servers include grammars that reflect the language used by people to request or to describe information services specific to that particular site. The grammar should try to capture all possible reasonable sentences or queries.
- the information server retrieves the relevant grammars for processing the query (step 206). Following this, a communication between the information server 110 and the service host 112 will be established. The information server will send the user's query and the retrieved grammars to the service host (step 208).
- the service host 112 coordinates the activities of the information server 110 with a NL server 114 and at least one destination server 116 to process the natural language query and perform the requested action.
- the service host 112 includes a dialog control program that manages interactions with users over several turns (e.g., it decides when to ask a question, when to give an answer, provides means for clarifying ambiguities, and provides error control and recovery during an interaction).
- the service host 112 then must determine what type of information is being requested as expressed in the user's natural language query. For example, is the query requiring an action, such as the placement of a telephone call, or requesting specific information, such as the location at which a particular movie is being shown.
- NL natural language server
- An NL server typically embodies a parser, an example of which is described in Pieraccini, R., Levin, E., "A Spontaneous- Speech Understanding System for Database Query Applications," ESCA Workshop on Spoken Dialogue Systems - Theories and Applications, May 30, June 2, 1995, Vigs_, Denmark, which is incorporated by reference.
- the semantic representations are then received by the service host 112.
- the NL server 114 parses the natural language query into a plurality of semantic tags (step 212) as will be described in detail hereinafter.
- the semantic tags are then sent from the NL server 114 to the service host 112 (step 214).
- the service host 112 converts the semantic tags to a string of logical search queries (step 216).
- the conversion of the semantic tags into a search query is accomplished by a knowledge structure which provides a mapping between the semantic tags and the language used for querying the database in the selected application (e.g., SQL).
- This mapping is performed by an ad-hoc program developed for the particular application.
- the resulting knowledge structure is stored in databases 118. Standard techniques may be used for developing the ad-hoc program. For the example if a standard SQL database is used, the mapping will look like:
- Action Call / Action_Object: Pizza Restaurant / Location: Main Street / City: Westfield 9
- a grammar (either handcrafted or automatically acquired using machine learning algorithms) is used to parse the natural language query to obtain a set of semantic tags that represent the query.
- the query can be received either as written text or can be translated from speech to text via a speech recognition system.
- the parser For the query "call the pizza place on Main Street in Westfield", the parser generates a semantic representation such as "Action: Call / Action_Object: Pizza_Restaurant / Location: Main Street / City: Westfield”.
- the semantic representation can then be used for generating a search query (e.g., in SQL) that will retrieve the corresponding information.
- the telephone number for the particular pizza restaurant is retrieved from the data resource.
- Action_Object Pizza_Restaurant
- the database query is generated.
- the database query is generally in one of the standard query languages (e.g. SQL).
- the search queries are forwarded to the web site associated with the URL transmitted by the user that is located at one of the destination servers 116 (step
- the web sites process the query and retrieve data that is believed to respond to the query (step 220).
- the query results are transmitted to the service host 112.
- the service host 112 determines if there are any ambiguities with respect to the response (step 222) and, if so, forwards additional queries to the user to help to resolve the ambiguities (step 224). The service host 112 then sends the responses to the information server 1 10 (step 226).
- one or more questions to the user are generated in order to disambiguate the query (e.g. Do you mean "Venezia” or "Bella Roma?").
- the answers to the additional questions are used to formulate a new logical search query.
- the service host 112 might then list the possibilities and ask the user to chose one of them.
- Parallel search queries can be launched from the original natural language query or parent query in order to fill in information that is missing from the 1 1 original query.
- parallel queries are added by using a logical AND/OR relation.
- the query "call ITALIAN RESTAURANT in WESTFIELD NEAR the INTERSECTION of EAST and BROAD STREET" can be segmented into two parallel searches queries.
- the first search query is directed to accessing a restaurant directory to list all Italian restaurants in Westfield.
- the second parallel search query is directed to accessing a street database to find all streets near the intersection.
- the service host 112 determines that a single response matches the database query, the requested information is retrieved from the database. In the case of the present example, the appropriate telephone number of the calling party is retrieved and confirmed using dialog control.
- the information i.e., phone number
- the service host 112 forwards the number to the information server 110 (step 226).
- the service host 112 then performs the desired action (step 228). In the above example, the service host would establish a telephone connection between the pizza restaurant and the user.
- Call connection can be provided by a standard telecom adjunct at the service host, i.e., the call to the telephone 122 of the pizza restaurant is initiated. Once a connection is established with the called party (e.g., the pizza restaurant) a direct connection is established between the user and the called party (e.g., pizza restaurant owner). Alternatively, instead of a telephone call, the user can connect to the called party's facsimile machine 124 or personal computer 126.
- the called party e.g., the pizza restaurant
- the called party e.g., pizza restaurant owner
- the user can connect to the called party's facsimile machine 124 or personal computer 126.
- the user may input the natural language query using a telephone.
- the user dials a telephone number to gain access to a particular Internet resource and speaks the natural language query, e.g., "call the pizza place on Main Street in Westfield.”
- the query is received by a speech recognizer 107 connected to the information server 110.
- An example of a speech recognizer which may be used is disclosed in L. Rabiner and B-H.Juang, "Fundamentals of Speech Recognition” Prentice Hall, Englewood Cliffs, NJ, 1993, which may be incorporated by reference.
- the speech recognizer translates a spoken query into the corresponding text for and returns it to the information server. 12
- the service host provides controller functionality.
- An integral functional component of the service host is a controller that uses the semantic representations obtained from the NL server to create a knowledge structure.
- the controller acts upon a strategy based on a sequence of operations (actions) and rules (see reference (2)).
- the sequence of operations determines which of a finite number of predetermined functions is invoked at any step of the processing.
- One of the predetermined functions that was mentioned previously is the interfacing with the natural language server to obtain a symbolic representation of the user's query i.e., semantic tagging.
- the other functions include interfacing with a speech generation mechanism to produce a spoken question or answer, and performing a search query to a database using the semantic tags obtained from the natural language server.
- the decision on which function to invoke is based on rules on the current information content of the controller.
- the information content corresponds to:
- Each semantic representation is identified as a particular object.
- the objects are then implemented by one or more knowledge structures which represent an intelligent search strategy that is used to interpret the query and ultimately retrieve the desired information from one or more data resources to perform a desired action.
- the knowledge structures are stored in one or more databases 118a, 118b, 118n.
- the knowledge structures are comprised of a plurality of objects. Each object is placed in a class and defined by unique properties such as, but not limited to, location, color, and size. This information serves as an identifier tag for the object.
- a class is a broad identifier that can describe a group of objects that share 13 some attributes. For example, a class may be restaurants which would include all eateries associated with a particular data resource.
- the objects are further arranged in different categories based on the inherent attributes of the particular object. Examples of such categories include, but are not limited to, callable objects, landmark objects, and functional objects.
- Callable objects are objects associated with telephone numbers (and/or fax, email) such as, but not limited to, people and businesses i.e., objects upon which an action such as calling or messaging can be performed. Callable objects are organized into classes in a hierarchical database. Examples of callable objects are restaurants, stores, services, entertainment and churches. Each callable object has a knowledge structure associated with it. An example of a knowledge structure for a restaurant is illustrated below:
- the callable objects are further arranged in a hierarchy that results in the knowledge structure producing a description of the particular callable object that is used to retrieve the desired information from one or more data resources.
- An example of a knowledge structure representing a hierarchy of information relating to a particular callable object is shown as follows:
- ⁇ Italian> is also associated with attributes such as food types, for example, ⁇ Italian> -> (pizza, pasta, general food)
- the second category of objects are landmark objects.
- Landmark objects are objects that relate typically in a geographic manner to the desired information but are provided for a contextual basis. Examples of landmark objects include, but are not limited to, streets, parks, ponds, monuments, and important buildings.
- Another category of objects are functional objects. Functional objects determine the relationships between one or more objects, such as between callable objects and landmark objects or between two callable objects or two landmark objects. Examples of such functions are "next to", “ across from” and “north”. All of these objects are stored in one or more databases.
- An example of a knowledge structure that may be used to interpret functional objects is as follows:
- the function [intersection( ⁇ streetl>, ⁇ street2>)] determines geographical coordinates of the intersection of two streets.
- functions denoting proximity such as "near”.
- the function [near(geogr_coordl, geogr_coordl>)] gives [near] value, perhaps ranging between (0. To 1.) to provide a relative measure of proximity.
- a user calls a toll free number that offers information services for the entire state.
- the information server component of this service as a basic feature would be configured with names of towns, counties, and other landmark locations.
- its grammar would embody general concepts about various information resources: restaurants, movie theaters, transportation, banks. Notice at information server level, the grammar contains no details of any specific information resource i.e., it knows about "banks, financial institutions, credit unions" and not specific names such as "Fleet Bank, Affinity Credit Union etc.”.
- the language model embodies something like:
- the first step is transcription of the above query into text form using automatic speech recognition, if it is a spoken utterance (step 302).
- the semantic analyzer identifies key concepts such as ⁇ pizza place>, ⁇ intersection>, ⁇ Main Street>, ⁇ Broad Street>, ⁇ Westfield> (step 304).
- the third step based on matches with the initial language model information as described above, the town name ⁇ Westf ⁇ eld>, ⁇ pizza> IS_A ⁇ restaurant>, ⁇ streets> IS A ⁇ location> will be identified (step 306). Given that, this will trigger real-time access of the databases (step 308): (1) Restaurant database, with the retrieval restricted by town name
Abstract
Description
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CA002293780A CA2293780C (en) | 1998-04-09 | 1999-04-01 | Method of using a natural language interface to retrieve information from one or more data resources |
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US09/058107 | 1998-04-09 | ||
US09/058,107 US6173279B1 (en) | 1998-04-09 | 1998-04-09 | Method of using a natural language interface to retrieve information from one or more data resources |
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US6173279B1 (en) | 2001-01-09 |
CA2293780A1 (en) | 1999-10-21 |
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