KR20130098578A - System and method for providing context cognition web service - Google Patents

System and method for providing context cognition web service Download PDF

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KR20130098578A
KR20130098578A KR1020120020193A KR20120020193A KR20130098578A KR 20130098578 A KR20130098578 A KR 20130098578A KR 1020120020193 A KR1020120020193 A KR 1020120020193A KR 20120020193 A KR20120020193 A KR 20120020193A KR 20130098578 A KR20130098578 A KR 20130098578A
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web service
service
web
query
ontology
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KR1020120020193A
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Korean (ko)
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KR101334558B1 (en
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염근혁
남태우
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부산대학교 산학협력단
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/951—Indexing; Web crawling techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/955—Retrieval from the web using information identifiers, e.g. uniform resource locators [URL]
    • G06F16/9566—URL specific, e.g. using aliases, detecting broken or misspelled links

Abstract

The present invention provides a context-aware web service providing method, wherein when a query for a web service search is transmitted from a web service requester, the web service provider preprocesses and analyzes the transmitted query, and registers, deletes, and searches for the web service. Searching for the existence of a web service including data on the analyzed query word through a supported universal description, discovery and integration (UDDI) registry, and a web service including data on the search result query word In the case of returning a specific URL of the corresponding web service, and if there is no web service including the data for the query result, the data related to the web service is defined as an object and the class and individual (indivisual). Is a service ontology language based on OWL (Ontology Web Language) It includes the process of performing ontology based web service inference based on the OWL-S (Ontology Web Language for Service, OWL-S) model.

Description

SYSTEM AND METHOD FOR PROVIDING CONTEXT COGNITION WEB SERVICE}

The present invention relates to a web service providing, and is applied between a customer and a service provider using an e-business process of the web service, and relates to a system and method for providing a web service whether the situation is applicable to all fields of the web service. will be.

 Service Oriented Architecture (SOA) is a concept of constructing a large computer system. It is a methodology that constructs the entire system by linking the service on the network by judging the software function corresponding to work processing as a service. In 2004, the IT industry has been focusing on responding to the demand for rapid changes in business processes. The core of such SOA realization technology is the web service technology that communicates between computers. As the technology evolves in the times, the web service technology, which is a general standard technology, is most widely used.

Meanwhile, a web service is a software system for interacting between different types of computers on a network, and the web service is a kind of service-oriented distributed computing technology. The Web services protocol stack consists of a three-layer structure of the Simple Object Access Protocol (SOAP), Web Service Description Languasge (WSDL), and Universal Description, Discovery and Integration (UDDI), and XML is used for all messaging, making it highly interoperable. The UDDI is a standard for the disclosure and search of web service related information. The service provider stores a list of services provided by the service consumer in an online repository known to the service consumer called UDDI. Will be found.

Existing UDDI searches the service only with the user's simple keyword search method and returns the result value.

However, service consumers cannot find a service if the keyword is wrong even if there is a service similar to the required service. In addition, as the size of SOA increases, the number of services provided will also increase exponentially. In such a situation, it is almost impossible to find and use the services desired by users.

Accordingly, the present invention is to provide a context-aware web service based on the semantic web and ontology, and to query a web service using an XML (eXtensible Markup Language) based SOAP (Single Object Access Protocol) message from a web service requester through a network. Is transmitted, the web service provider analyzes the transmitted query word through a preprocessing process, and then data about the analyzed query word through a universal description, discovery and integration (UDDI) registry that supports registration, deletion, and retrieval of the web service. Searches for the existence of a web service that contains a web service and returns the specific URL of the web service if it exists, and if it does not exist, the web service based on the OWL-S model, which is a service ontology language based on the OWL To provide a technique for performing inference.

According to an aspect of the present invention, in a situation-aware web service providing method, when a query for web service search is transmitted from a web service requester, the web service provider preprocesses and analyzes the transmitted query and registering the web service. Searching for the existence of a web service including data about the analyzed query word through a universal description, discovery and integration (UDDI) registry supporting deletion and search, and including data about the search result query word. If a web service exists, returning a specific URL of the web service, and if there is no web service including data about the query result, the data related to the web service is defined as an object and the class and Service based on OWL (Ontology Web Language), built individually It includes the process of performing ontology based web service inference based on OWL-S (Ontology Web Language for Service, OWL-S) model.

According to another aspect of the present invention, in a context-aware web service providing system, a web service search using an XML-based SOAP message from a client using a web service through a WSDL (Web Service Description Language) and an application executed on the client When the query is transmitted, a web service including data about the analyzed query is preprocessed through the transmitted query and analyzed through a universal description, discovery and integration (UDDI) registry that supports registration, deletion, and search of a web service. Is a web service server and a web service server that differentiates and returns a corresponding web service type into a single or complex web service according to whether a web service including data on the search result exists. A web server that provides web services to It should.

The present invention is applied to the semantic web and ontology technology to reduce the search time of the web service requester at the time of providing a web search service, to provide a high search success rate to accurately search for the desired information, and to improve the web service and reliability of the web service It is effective to ensure.

1 is a flowchart illustrating a method of providing a context-aware web service according to an embodiment of the present invention.
2 (a) and (b) is a diagram illustrating a class on the OWL-S according to an embodiment of the present invention.
3 is a diagram illustrating an ontology model according to an embodiment of the present invention.
4 is an exemplary diagram representing OWL based on actual XML according to an embodiment of the present invention.
5 is a block diagram of a context-aware web service providing system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be appreciated that those skilled in the art will readily observe that certain changes in form and detail may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. To those of ordinary skill in the art.

First, the present invention relates to the provision of a web service, which is applied between a customer and a service provider using an e-business process of the web service, and applicable to all fields of the web service.

More specifically, it is to provide context-aware web services based on semantic web and ontology, and is a query word for searching web services using XML (eXtensible Markup Language) based SOAP (Single Object Access Protocol) message from a web service requester through a network. Is transmitted, the web service provider analyzes the transmitted query word through a preprocessing process, and then data about the analyzed query word through a universal description, discovery and integration (UDDI) registry that supports registration, deletion, and retrieval of the web service. Searches for the existence of a web service that contains a web service and returns the specific URL of the web service if it exists. If it does not exist, the web service based on the OWL-S model, which is a service ontology language based on the OWL Inferencing by applying semantic web and ontology technology Shorten the search time of the Web service requester and the City's offer, to provide a high success rate for searches accurately retrieve the desired information and technology to provide a reliable guarantee for the improvement of Web services and Web services.

Hereinafter, a situational web service providing method according to an exemplary embodiment of the present invention will be described with reference to FIG. 1.

1 is a flowchart illustrating a method of providing a context-aware web service according to an embodiment of the present invention.

Referring to FIG. 1, in step 110, a query for searching for a web service is transmitted from a web service requester, and in step 112, the web service provider receiving the query is preprocessed and analyzed.

At this time, the preprocessing of the transmitted query is to extract input, output, precondition and effect (IOPE) of the query, for example, the "card number" in the card payment web service system. When the "payment amount" is input, the precondition for the input is that it is not "theft card", and the input of such an input and the precondition is "notification of the payment result".

In step 114, the existence of a web service including data on the analyzed query is checked through a Universal Descripton, Discovery and Integration (UDDI) registry that supports registration, deletion, and retrieval of web services.

In other words, the service is first searched for a service matching only the corresponding keyword of the analyzed query word, and the UDDI registry is a standard developed to support a registry function for a web service. This UDDI registry provides information about business objects and the registration, deletion, and retrieval of web services provided by the business objects.

As a result of the check of the existence of the web service in step 114, if there exists, the process proceeds to step 116 and returns a specific URL of the web service to the web service requester. Based on the OWL-S (Ontology Web Language for Service, OWL-S) model, which is a service ontology language based on OWL (Ontology Web Language), which is defined as objects and relationships, and is divided into classes and individual visuals. Perform Web service inference

That is, after the data about the analyzed query word is designated as an individual, the process moves to step 120 to perform comparison / contrast with a web service within a preset similarity level.

In step 122, it is checked whether there is a web service above the preset similarity, and if it exists, return to the web service requester as a single configuration web service. If not, go to step 126 to combine the web services in a preset pattern. In step 128, the UDDI (Universal Descripton, Discovery and Integration) registry again performs comparison / contrast with the web service within the similarity level.

In this case, the web service combination is performed based on a syntactical constraint and a semantic constraint. The condition of the syntactic constraint is that at least two specific web services are sequentially When connected, the output value of the preceding web service is delivered as the input value of the following web service, and the type or structure must be the same between the return value and the input parameter between the preceding and following web services.

More specifically, the syntactic constraint is that when the web service A and the web service B are sequentially connected, the output value of A is passed as the input value of the web service B, and thus the type or structure must be the same between these return values and the input parameters.

In addition, the domains of interest of the business functions or services provided by the service operations must be identical. The embodiment of the present invention extends the process model of OWL-S to present a model that satisfies both of these constraints. Messages conveyed between services include not only parameters and types, but also business role information and unit information assigned to the types. For example, a message that includes a product price affects the execution result of the web service depending on whether the unit is in won or dollars.

Messages delivered between the services may be configured as follows.

Message M = {P, T, U, R}

Where P is a parameter name, T is a function that assigns a data type to each parameter, U is a function that provides the unit of measure used for each parameter, and R is a function that assigns a business role to each parameter.

In addition, the message transmitted between the services is composed of a name and a description summarizing the characteristics of the service operation, the mode (mode), the purpose of operation to describe the input / output message and the meaning of the operation, category information It includes. A web service consists of a descriptor describing a service name and a service characteristic, and has the purpose and category information of the service in the same manner as an operation. The purpose here is the business function provided by the service operations, the category describing the service domain of interest and including the category of all operations provided by the service. It also has a set of binding information describing how to access the service.

Operation Opi = {Descriptioni, Modei, Ini, Outi, Purposei, Categoryi}

Descriptioni: A text summary of the job function

Modei: a mode of operation m {one-way, notification, request-response}

Ini: input message

Outi: Output message

Purposei: The purpose of the service, the business function provided by the service operations

Categoryi: description of category information, service domain of interest

Service WSi = {Descriptioni, SETOPi, Bindingi, Purposei, Categoryi}

Descriptioni: Summary of service characteristics

SETOPi: Web Service Operation

Bindingi: Web Services' Non-Binding Protocol

Purposei: Purpose of web service operation {Purposei (opi) | opi SETOPi}

Categoryi: A collection of web service operation categories and service categories.

{Categoryi (opi) | opi SETOPi} {Caterotyi (WSi)}

At this time, in the service operation mode, the one-way is a case where an input has a branch but no output, and a request-response has a case where both an input and an output are present. notification is the case of having output but no input, and solicit-response means having both incoming and output but passing the output before receiving input.

In step 130, as a result of performing the operation of step 128, it is checked whether there is a combination of web services having a predetermined similarity level or more, and if there exists, the process moves to step 132 and returns to the composite configuration web service. Perform the process.

It provides a service-oriented architecture (SOA) for an e-business service according to an embodiment of the present invention, and performs communication through a SOAP protocol, which is a standard of XML protocol.

In addition, the web service provider according to an embodiment of the present invention, the message used in the request and response of the web service includes a parameter for each type, business role information and unit information assigned to the type, the meaning of a specific web service It is created as a service description in XML format that describes the API and message application programming interface (API).

As described above, the steps 110 to 132 are described as an example through the development of a credit card payment system, and if there is an existing developed web service in developing a system for making a payment using card number information, the system will be much simpler. Development is possible. According to an embodiment of the present invention, the web service search is performed, and the first search operation is a search through keyword matching. Matching is checked against the input, output, preconditions and effects of the keyword web service, and if there is a matching web service, the corresponding web service is returned. Likewise, semantic-based service inference based on OWL-S is performed.

The type of service desired by the developer is a service in which the card is automatically settled by entering the "card number" and "payment amount". The prerequisite is that it will not be a "stolen card." The result is a "Notification of Payment Result" message that the payment was successful, and if so, the "transaction record" of the card is updated.

In the input, output, preconditions and effects, the input will be the card number and payment amount, the output will be notified of the payment result, the precondition will not be the stolen card, the effect will be the transaction record update.

In OWL-S, a service is described based on ServiceProfile, ServiceGrounding, and ServiceModel classes. In the ServiceProfile, the input, output, precondition, and result of a service are defined. When the service currently stored has "payment service A", payment service A receives "card number", "card company name" and "payment amount" as input, and not "stolen card". "Send payment result SMS" is output, "Transaction record update" is a post condition.

This is illustrated in FIGS. 2A and 2B.

Based on the OWL-S model, using the class and individual relations, the situation recognition rule is created to compare the requested service with the currently held payment service A to determine similarity. As a result of judgment, if a certain level of similarity appears, the service can be used by finally returning the WSDL defined in ServiceGround. If it is not composed of a single service, the searched service is again determined to be similar to other services. If a new service is found through this, the service is composed and provided in a complex manner.

The ontology model according to the embodiment of the present invention is illustrated in FIG. 3.

In service, profile, grounding, and resource are defined, and input, output, resule, and precondition are defined in detail in profile. Each element can have one or more values. If this is expressed as OWL based on actual XML, it is as shown in FIG.

In the above, the method of providing a web service according to an embodiment of the present invention has been described.

Hereinafter, a situational web service providing system according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 5.

5 is a block diagram of a context-aware web service providing system according to an embodiment of the present invention.

The context-aware web service providing system to which the present invention is applied includes a client 510, a context-aware web service server 514, and a web server 524.

The client 510 uses a web service through a web service description language (WSDL). The WSDL is distributed in advance to a predetermined predetermined client or provided by informing the client 510 of a URL of a web service platform. The WSDL describes a SOAP message, a protocol, and internet location information of a web service used to access a web service. It is used to

The context-aware web service server 514 is connected to a plurality of clients 510 through a network 512 to transmit a query for a web service search using an XML-based SOAP message from an application running on the client 510. If the query is preprocessed and analyzed, the existence of a web service including data on the analyzed query word is provided through a universal description, discovery and integration (UDDI) registry that supports registration, deletion, and search of a web service. Search and differentiate the corresponding web service type into a single or complex web service according to the existence of the web service including the data of the search result and return.

The situation-aware web service server 514 receives a request for a web service from the client 510, the web service request and transmission unit 516 for transmitting the requested web service, and for the e-business entity UDDI registry section 518 that supports the registration, deletion, and discovery of information and web services provided by the corresponding e-business objects, and data related to web services as objects and relationships, and in class and individual Web service inference unit that performs ontology-based web service inference based on Onology Web Language for Service (OWL-S) model, a service ontology language based on OWL (Ontology Web Language) And a web service return unit 522 which performs a specific web service return under the control of the web service inference unit.

The web service inference unit 520 executes web service inference through comparison / contrast with a similarity level web service by designating the data of the query word analyzed through ontology based service inference as an individual.

In addition, the web service inference unit 520 returns a single configuration web service when a web service having a predetermined similarity level or more exists, and combines web services in a preset pattern when there is no web description. Integration) The comparison / contrast with the web service of the similarity level preset in the registry is performed again, and if the web service combination having a predetermined similarity or more exists as a result of the execution, the control is returned to the composite configuration web service.

The web server 524 provides a web service to the web service server 514 which is the situation.

As described above, an operation relating to a system and method for providing a web service according to the present invention can be made. Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. Can be. Accordingly, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by equivalents of the claims and the claims.

510: Client 514: Situation Server
516: Web service request and transmission unit 518: UDDI registry unit
520: Web service inference unit 522: Web service return unit
524: web server

Claims (15)

In the context-aware web service providing method,
When the query for web service search is transmitted from the web service requester, the web service provider preprocesses and analyzes the transmitted query;
Searching for the existence of a web service including data on the analyzed query word through a universal description, discovery and integration (UDDI) registry that supports registration, deletion and retrieval of a web service;
Returning a specific URL of the web service if the web service including the data about the query result exists;
If there is no web service including data about the query result, the data related to the web service are defined as objects and relationships, and based on OWL (Ontology Web Language), which is constructed by classifying and classifying individual objects. A method of providing a context-aware web service comprising the step of performing ontology-based web service inference based on an Ontology Web Language for Service (OWL-S) model, which is a service ontology language. The method of claim 1, wherein the performing of the web service inference is performed by:
A method of providing a context-sensitive web service characterized by inferring a web service through comparison / contrast with a web service within a predetermined similarity level by designating data about a query word analyzed through ontology-based service inference as an individual. The method of claim 2, wherein the web service returns a single configuration web service if the web service having a predetermined similarity level or more exists. Method for providing a context-aware web service characterized in that the comparison / contrast with the web service of the similarity level set again. The method of claim 3, wherein the web service is returned to the composite web service if there is a web service combination having a predetermined similarity or higher as a result of the rerun. The method of claim 1, wherein the preprocessing of the transmitted query is performed.
Method of providing a context-aware web service characterized by extracting input, output, precondition and effect of the query. The web service combination of claim 3, wherein the web service combination comprises:
It is performed based on syntactical constraints and semantic constraints. The condition of the syntactic constraint is that the output value of the preceding web service is followed when the at least two specific web services are sequentially connected. Method of providing a web service, characterized in that the type or structure between the return value and the input parameters between the preceding / following web services to be delivered as an input value of the web service. The method of claim 1, wherein the web service,
A method for providing a context-aware web service that provides an e-business service through a service-oriented architecture (SOA), and performs communication through a SOAP protocol, which is a standard of the XML protocol. The web service provider of claim 1, wherein the web service provider comprises:
The message used in the request and response of the web service includes a parameter for each type, business role information and unit information assigned to the type, and has an XML form describing the meaning of a specific web service and a message application programming interface (API). Method for providing a context-aware web service, characterized in that generated by the service description (description). The process of claim 1, wherein the searching of the existence of a web service including data about the analyzed query word comprises:
And searching for a service that is matched with only a corresponding keyword of the analyzed query word. In a situation-aware web service providing system,
A client using a web service through the Web Service Description Language (WSDL),
When a query for a web service search using an XML-based SOAP message is transmitted from an application running on the client, the UDDI (Universal Description, Discovery and Support) preprocesses and analyzes the transmitted query, and supports registration, deletion, and retrieval of the web service. Search for the existence of a web service including data about the analyzed query word through the registry, and configure the web service type in a single or complex web service type according to the existence of a web service including data for the search result. To differentiate and return to the web service server and
And a web server that provides a web service to the situation-aware web service server. The web service server of claim 10, wherein
A web service request and transmission unit for receiving a request for a web service from the client and transmitting the requested web service;
a UDDI registry that supports the registration, deletion and discovery of information about e-business objects and web services provided by the e-business objects;
OWL-S (Ontology Web Language for Service, OWL-), a service ontology language based on Ontology Web Language (OWL), which defines data related to web services as objects and relationships, and classifies them into classes and individual visuals. S) a web service inference unit that performs ontology based web service inference based on the model;
And a web service return unit for performing a specific web service return under the control of the web service inference unit. The system of claim 10, wherein the WSDL is provided in advance to a predetermined predetermined client or by providing a URL of a web service platform to the client. The web service inference unit of claim 11,
A web service providing system that executes web service inference through comparison / contrast with preset similarity level web service by designating the data about the query word analyzed through ontology based service inference as the individual. The web service inference unit of claim 11,
If there is a web service above the preset similarity, the web service returns a single configuration web service, and if it does not exist, combines the web service in a preset pattern and sets the web service of the similarity level preset in the Universal Description, Discovery and Integration (UDDI) registry. And performing comparison / contrast with the data again and returning to the composite web service if there is a web service combination having a predetermined similarity or more as a result of the execution. The web service inference unit of claim 11,
A context-aware web service providing system characterized by performing preprocessing of a query by extracting inputs, outputs, preconditions and effects of the query.
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CN103886526A (en) * 2014-03-03 2014-06-25 中山大学 Resource integration system and method for home-based care for the aged health service system

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US20080195630A1 (en) * 2007-02-13 2008-08-14 Amadeus S.A.S. Web service interrogation method and apparatus

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