KR100912374B1 - Method for searching context information based on xml - Google Patents

Abstract

The present invention relates to an Extensible Markup Language (XML) based context information query method, and more particularly, to an XML based context information query method for querying context information between heterogeneous computing devices in a ubiquitous environment. To this end, the present invention provides a method for querying context information between heterogeneous computing devices, comprising: checking whether there is a context information query request; As a result of the check, if there is a context information query request, the method may further include converting to SPARQL which is an RDF query language corresponding to a search request defined in XML according to the input context information query.

Context, XML, SPARQL, Computing Device, Ubiquitous

Description

Context-based Query Method for Context Information {METHOD FOR SEARCHING CONTEXT INFORMATION BASED ON XML}

The present invention relates to an Extensible Markup Language (XML) based context information query method, and more particularly, to an XML based context information query method for querying context information between heterogeneous computing devices in a ubiquitous environment.

In general, a ubiquitous computing environment refers to an environment in which a desired service can be provided by accessing a network anytime and anywhere. In order to provide various services in such a ubiquitous environment, collaboration between all computing devices in the surrounding space providing individual services is a prerequisite. Individual computing devices must share information about the services or resources they can provide, and users must be able to search for all available peripheral services anytime, anywhere.

However, in the conventional ubiquitous computing environment, heterogeneous computing devices cannot query context information about shared services and resources owned by the computing devices, and thus, context information and correlations between them cannot be expressed.

Accordingly, an object of the present invention is to provide an XML-based context information query method that enables querying context information between heterogeneous computing devices in a ubiquitous environment.

It is also an object of the present invention to provide an XML-based context information query method that can formalize context information exchanged for collaboration between heterogeneous computing devices in a ubiquitous environment.

Another object of the present invention is to provide an XML-based context information query method that allows context information to be exchanged between heterogeneous systems by an XML form query by storing context information in an RDF form.

It is still another object of the present invention to provide an XML-based context information query method that converts an XML request form into SPARQL to enable various types of queries.

In accordance with an aspect of the present invention, an XML-based context information query method is a method for querying context information between heterogeneous computing devices. The method for querying context information between heterogeneous computing devices includes XML. Checking whether there is a defined context information query request; And as a result of the checking, converting the context information query request into SPARQL, which is a RDF (Resource Description Framework) query language.

And storing and managing information on the resources found in the RDF form.

The step of converting to SPARQL is characterized in that one context query included in the XML search request document is converted into one SPARQL.

The context search request defined in XML may specify a search target context with a value of a group, type, and item attribute of a context query, and specify a detailed search condition with a condition element.

The structure of the XML document may include a ubiquitous mobile object device (UMO Device) including information about a computing device requesting a search, a query list including a query list for context search, a kind of context to be searched, and It consists of a structure of a context query including a search condition, a condition set that aggregates search conditions into logical operations, and a condition that describes a context search condition.

The condition set may include two or more search conditions or a set of search conditions.

The condition may include a property name of the context and a comparison operator, and the comparison target value may be specified as a text value.

According to the above-mentioned problem solving means, the present invention stores and manages information about its own resources and retrieved resources in the form of RDF, thereby flexibly coping with the change of information and having excellent scalability for new information. In particular, the use of XML-type search request facilitates the exchange of information between heterogeneous systems, and by converting it to SPARQL, various types of queries are possible.

The XML-based context information query method of the present invention can flexibly cope with the change of information by managing the context by storing information about its own resource and retrieved resources in the form of an RDF query language. In particular, it facilitates the exchange of information between heterogeneous systems using XML search requests, and has a technical gist that enables various types of queries by converting to SPARQL.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail, focusing on the parts necessary to understand the operation and action according to the present invention.

First, the context information formulated by the present invention will be described.

end. Formalization of context information

In the ubiquitous computing environment, information about various services and resources that a computing device can use is defined as context information. Context information may be exchanged between computing devices, and the exchanged information may be stored in the context store of each computing device and used for collaboration between computing devices, such as the use of shared services and resources.

The context information may be classified as follows.

Hardware context: Information about peripheral hardware device resources such as printers, monitors, and keyboards.

User context: User information such as user profile and location

Physical context: physical information such as temperature, humidity, light intensity

History context: user preferences, contextual record over time

As described above, context information that the computing device may have may be classified as shown in the accompanying drawings.

1 is an exemplary view showing context information of the present invention.

Referring to FIG. 1, the context information includes the following information.

First, the computing device (UMO: Ubiquitous Mobile Object) information 11 includes detailed information about the unique identifier, name, version, provider, etc. of the computing device.

Common information 12 also describes common information, such as network communication channels, that computing devices may have or use in common.

In addition, the device information 13 is defined for the device, and each device describes information indicating whether the device is a local resource, a virtual resource, or a discovery resource.

Local resources 14 also describe information about shared services and resources that a local computing device can provide.

In addition, the virtual resource 15 describes information on a virtual resource currently being provided and installed from a surrounding computing device.

The search resource 16 describes information about shared services and resources that can be provided by surrounding computing devices collected by contextual information exchange between computing devices.

I. Context information technology using RDF (Resource Description Framework)

RDF is an XML standard for expressing information of resources on the web defined by the World Wide Web Consortium (W3C), and uses RDF as a method for describing the formal context information of the present invention. The context information includes context information for shared services and resources owned by the local computing device and context information retrieved from the peripheral computing device. In addition, such information may be dynamically added or deleted by context information exchange between computing devices.

Therefore, context information is stored in RDF format according to various expressive powers and requests for extensibility, and queries for information use SPARQL.

That is, the form of the context information formulated by the present invention can be expressed using the RDF schema as shown in FIG.

All. Contextual Information Retrieval Using XML

Use XML to retrieve stored contexts. By performing the search using XML, it is independent of the target platform or implementation environment and can guarantee the extensibility of changing the form of query.

3 is an exemplary diagram showing an XML document structure for querying context information of the present invention.

Referring to FIG. 3, a ubiquitous mobile object device (UMO Device): includes information about a computing device requesting a search.

Query List: A container that contains a list of queries for context search. It contains one or more queries.

ContextQuery: A unit for context searching, which includes the kind of context required and the search condition.

ConditionSet: Performs a function of grouping search conditions using logical operations. It includes two or more search conditions or a set of search conditions, and can perform AND and OR operations.

Condition: Describes the context search condition. Contains the attribute name of the context and the comparison operator, and the value to compare can be specified as a text value.

Meanwhile, the search request defined in XML should be converted to SPARQL, which is an RDF query language for RDF search. Here, the context search request defined in XML is as shown in FIG. 4, and the information search request converted to SPARQL form is shown in FIG. 5.

Accordingly, one context query (ContextQuery) included in the XML search request document is converted into one SPARQL. Context Query You can specify the search target context using the values of group, type, and item attributes of the ContextQuery, and you can specify the detailed search conditions using the condition element.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is an exemplary view showing the context information of the present invention.

2 is an exemplary diagram of an RDF schema showing the form of formalized context information of the present invention.

3 is an exemplary view showing an XML document structure for querying context information of the present invention.

4 is an exemplary view showing a context search request document defined in XML of the present invention.

5 is an exemplary view showing an information search request document converted to SPARQL form of the present invention.

Claims (14)

In the method for querying context information between heterogeneous computing devices, Checking whether there is a context information query request defined in XML; If the context information query request is found, converting the context information query request to SPARQL, which is a resource description framework (RDF) query language; XML-based context information query method comprising a. According to claim 1, Managing context by storing information about resources found in the form of the RDF query language XML-based context information query method, characterized in that further comprises. The method of claim 1 or 2, wherein the context is XML-based context information query method characterized in that the base class is stored in the form of RDF as defined as follows. <? xml version = '1.0' encoding = 'UTF-8'?> <! DOCTYPE rdf: RDF [     <! ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>     <! ENTITY a 'http://protege.stanford.edu/system#'>     <! ENTITY umo 'http://www.keti.re.kr/ubicom/umo#'>     <! ENTITY rdfs 'http://www.w3.org/2000/01/rdf-schema#'> ]> <rdf: RDF xmlns: rdf = "&rdf;" xmlns: a = "&a;"         xmlns: umo = "&umo;" xmlns: rdfs = "&rdfs;">    <rdfs: Class rdf: about = "&umo; class" rdfs: label = "class">       <rdfs: subClassOf rdf: resource = "&rdfs; Resource" />    </ rdfs: Class> The method of claim 1 or 2, wherein the context is XML-based context information query method characterized in that the device information is stored in the form of RDF as defined as follows. <rdfs: Class rdf: about = "&umo; Device" rdfs: label = "Device">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class>    <rdfs: Class rdf: about = "&umo; DiscoveredResource"       rdfs: label = "DiscoveredResource">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class> The method of claim 1 or 2, wherein the context is XML-based context information query method characterized in that is stored in the form of RDF as defined for the local resource information as follows.    <rdfs: Class rdf: about = "&umo; LocalResource" rdfs: label = "LocalResource">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class> The method of claim 1 or 2, wherein the context is XML-based context information query method characterized in that the computing device information is stored in the form of RDF as follows.    <rdfs: Class rdf: about = "&umo; UMO" rdfs: label = "UMO">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class>    <rdfs: Class rdf: about = "&umo; VirtualResource" rdfs: label = "VirtualResource">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class> The method of claim 1 or 2, wherein the context is XML-based context information query method characterized in that the common information is stored in the form of RDF as defined as follows. <rdfs: Class rdf: about = "&umo; Public"     rdfs: label = "struct">       <rdfs: subClassOf rdf: resource = "&umo; class" />    </ rdfs: Class> </ rdf: RDF> The method of claim 1, wherein the converting to SPARQL comprises: An XML-based context information query method, wherein one context query included in an XML search request document is converted into one SPARQL. According to claim 1, The context information query request defined in the XML, An XML-based context information query method, characterized in that a search target context can be specified by a value of a group, type, and item attribute of a context query, and a detailed search condition can be specified by a condition element. According to claim 1, The context search request document defined in XML, XML-based context information query method characterized in that requesting a specific context search as defined as follows. <? xml version = "1.0" encoding = "UTF-8"?> <UMOContextQuery xmlns = "http://www.keti.re.kr/ubicom/umo/" version = "1.0">   <UMODevice id = "KETI_UMO_ID_0001" name = "KETI Mobile device 001" />   <QueryList>     <ContextQuery group = "*" type = "*" item = "Monitor">       <ConditionSet type = "AND">         <Condition name = "horizontal resolution" compare = "&gt; ="> 1024 </ Condition>         <Condition name = "vertical resolution" compare = "&gt; ="> 768 </ Condition>       </ ConditionSet>     </ ContextQuery>   </ QueryList> </ UMOContextQuery> The information search request converted to the SPARQL form of claim 1, XML-based context information query method, characterized in that for searching a specific context as defined as follows. PREFIX umo: <http://keti.re.kr/ubicom/umo#> PREFIX ns: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT? X WHERE { ? x ns: type umo: Monitor. ? x umo: Monitor_horizon_resolution? y.Filter (? y> = \ "1024" \) ? x umo: Monitor_vertical_resolution? z.Filter (? z> = \ "768" \) } The XML document structure of claim 1, wherein the XML document structure of the context information query request defined in XML is: Ubiquitous mobile object device (UMO Device) including information about the computing device requesting the search, A query list including a list of queries for context search, ContextQuery including the kind of context to be searched and the search condition, A ConditionSet that aggregates search conditions into logical operations, Condition describing the context search condition XML-based context information query method comprising a structure of. The method of claim 12, wherein the condition set, An XML-based context information query method comprising two or more search conditions or a set of search conditions. The method of claim 12, wherein the condition is An XML-based context information query method comprising a property name of a context and a comparison operator and a value to be compared can be specified as a text value.

Images