JP2004348593A - Storage search device, storage search method, storage search program, and storage search program recording medium - Google Patents

Abstract

Kind Code: A1 A storage search device and storage search that can flexibly cope with addition, change, and deletion of meta information without depending on an application program even if the object-oriented structured document database does not have a function of storing meta information. A method, a storage search program, and a storage search program recording medium are provided.
A storage / retrieval system includes an application, a storage / retrieval device, and an object-oriented structured document database (hereinafter, referred to as a database). The storage / retrieval apparatus 200 has a function of storing the structured document and the meta information passed from the application 100 in the database 300, and a function of storing the structured document and the meta information stored in the database 300 with the path search formula passed from the application 100. And a function of returning a search result to the application 100.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to middleware used in a computer system for storing and retrieving structured documents, and more particularly, for storing and retrieving structured documents and meta information in an object-oriented database having no function of storing meta information. Regarding middleware.
[0002]
[Prior art]
In recent years, structured documents such as XML (extensible Markup Language) have been used as data formats for sharing various information on the Internet. XML is a type of standardized structured document standardized in December 1997 by the standardization organization W3C (World Wide Web Consortium). Data written in accordance with the XML standard is called an XML document.
[0003]
An XML document is a document that can be decrypted and edited by a person. However, at the same time, the XML document is structured using tags, and is data that can be easily processed by a computer program. The tag of the XML document is a character string apparently surrounded by “<” and “>” embedded in the document. The tag has a start tag and an end tag, and an area surrounded by the start tag and the end tag is called an element. An element can be nested, such as having multiple child elements, each child element having multiple grandchild elements. Therefore, the XML document can represent a multi-stage tree structure.
[0004]
At present, information represented by an XML document is diversified, and is applied to a specific application by defining rules for tagging in the XML standard. For example, RosettaNet (http://www.rosettanet.gr.jp/) and ebXML (http://www.ebxml.org/) for cooperation between companies, RDF (Resource Definition Framework, RDF for describing resource information) http://www.w3.org/RDF/), SVG (Scalable Vector Graphics) for describing multimedia information, SMIL (Synchronized Multimedia Integration Language), and the like. In order to confirm that each system is an XML document to be processed, a system that uses the XML document for a specific purpose described above uses an XML schema language (XML Schema, http://www.w3.org/). By performing verification using XML / Schema) and excluding non-defined XML documents, processing can be focused on only the XML document to be processed.
[0005]
When a computer program processes an XML document, it is more convenient to convert the tree structure represented by the XML document into a tree structure on a computer memory. A representation of an XML document as a tree structure on a computer memory is called a DOM (Document Object Model). DOM is also standardized by W3C. DOM expresses an XML document by a node / link model including nodes and links. Elements of an XML document correspond to DOM nodes.
[0006]
When creating a system for processing DOM data on a computer memory, it is convenient if a search expression that points to a node in the DOM data can be used. For this purpose, a notation called XPath (XML Path Language) is standardized by the W3C. By using a path search formula such as XPath, a node in the DOM data that meets a condition can be indicated.
[0007]
Since various technologies related to XML have been standardized as described above and various computer systems have been developed based on XML, the need for a database for storing XML documents has recently increased. . Databases that store XML are roughly classified into three types: relational databases, object-oriented databases, and document databases.
[0008]
In order to store an XML document in a relational database, it is necessary to convert the XML document into a two-dimensional table which is a storage model of the relational database. At present, a relational database management system (RDBMS) based on a relational model is widely used as a mainstream database management system (DBMS) for a customer management database, an article management database, and the like. Therefore, it is easy to use a highly reliable relational database management system (RDBMS). However, in order to convert an XML document into a two-dimensional table format, the format and purpose of use of the original XML document must be analyzed. It is necessary to consider the optimal conversion method and design a relational schema. Therefore, the design and construction costs are high and suitable for large-scale system development, but unsuitable for small- and medium-scale system development.
[0009]
To store an XML document in the object-oriented database, the XML document may be stored in the database as it is. This is because the object-oriented database can store the tree structure, which is the basic structure of the XML document, as it is as the parent-child relationship of the objects. Therefore, in the development of small- and medium-sized systems in which it is important to reduce the cost of system development and shorten the construction period, XML documents are stored in a database as tree-structured data in a database, since a complex schema design is not required. An object-oriented database that can perform a search by using is widely used. In the following description, an object-oriented database that stores structured documents is called an object-oriented structured document database.
[0010]
When storing an XML document in the document database, the structured document is stored as a sentence. The document database is a database that treats structured documents as sentences, performs natural language analysis, performs indexing, and stores the documents in the database, so that similarity search of sentences is possible. Therefore, the document database is used specifically for storing text data in the XML document, but is not used except for the system development that handles text.
[0011]
In the storage of the structured document in the object-oriented structured document database, the structured document shown in FIG. 19 is expressed as a tree structure of nodes and links as shown in FIG. 20A, and is stored in the form of node objects and links between them. It is realized by doing. 20B is a legend explaining the notation method of FIG. 20A. According to this, the tree structure always has a root node, and the element of the structured document is an element node. , Attributes are stored as attribute nodes, and character strings are stored as text nodes.
[0012]
The object-oriented structured document database has three functions of a tree structure acquisition function, a tree structure operation function, and a path search function for the tree structure of the nodes and links.
[0013]
The tree structure acquisition function is a function of accessing a structured document stored in a database as a tree structure and acquiring node information. This allows the database client to follow the tree structure and acquire node information. By tracing the tree structure, the original structured document can be reconstructed. For example, the node n shown in FIG.₀₀₂Is designated as the base point, the partially structured document shown in FIG. 21 can be extracted.
[0014]
The tree structure operation function is a function of accessing a structured document stored in the database as a tree structure and operating node information. As a result, the database client can specify a base node and add a new child node to the specified node. By using this function, another structured document can be embedded as a partially structured document in the structured document. For example, the partially structured document shown in FIG.₀₀₂When it is added to the child node of, the tree structure shown in FIG. 23 is obtained. This function is called partially structured document insertion. Note that the insertion of a partially structured document is performed using the root node (n in FIG. 23).₀₀₀By designating the insertion of the structured document itself on the basis of ()), it is possible to insert all the documents of the structured document.
[0015]
The path search function is a function of acquiring a corresponding node group as a node set by a path search formula. A path is a character string in which a plurality of element names and attribute names are separated by “/”, and is a concept similar to a directory path used in a UNIX (registered trademark) OS or the like, and follows a tree structure of a structured document. Represents an order. Further, a conditional expression can be added to the path search expression. The conditional expression indicates that nodes should be narrowed down when tracing the tree structure. FIG. 24 is an example of a path search formula. In this example, it is shown that an author node, which is a child of the order node, a child of the book node, is returned, and that the value of the price node is limited to a book node whose value is 200 or more. The path search formula shown in FIG. 24 is based on the root node, and the node set N = ｛n shown in FIG.₀₀₅｝ Is returned.
[0016]
As described above, an object-oriented database is suitable for a small- to medium-sized database system that needs to store a structured document such as an XML document.
[0017]
Prior art document information related to this application includes the following.
[0018]
[Patent Document 1]
JP-A-2001-331479
[0019]
[Problems to be solved by the invention]
By the way, conventionally, when a computer system is developed using an object-oriented database and an application program, additional information outside the document (for example, creator, date, update history, etc. of the XML document) is added to a structured document such as an XML document. Hereinafter, this is referred to as meta information) and stored in an object-oriented database in many cases. In such a case, since there is a function of adding an arbitrary structure to the schema of the original XML document, a method of adding meta information to the schema of the XML document has been used.
[0020]
However, in the above method, the original XML document and the meta information portion are not distinguished on the schema of the object-oriented database.
(1) When storing an XML document in an object-oriented database, the XML document and the meta information are combined and then stored.
(2) When retrieving an XML document from an object-oriented database, the original XML document is extracted with the meta information part included.
Is performed. In particular, regarding (2), if the XML document to be handled is a standardized XML document such as RDF or SMIL, an error occurs in the meta information part as an invalid schema. The problem that it cannot be used for such processing occurs.
[0021]
For this reason, it is usually necessary to provide a means for deleting the meta information portion, which is an unnecessary portion of the application, so that the application can handle the meta information portion in the RDF or SMIL processing. As a result, the following problems occur in the development of the computer system. I was
[0022]
(1) The application needs to cope with the addition and deletion of the meta information, and the development cost is increased.
[0023]
(2) It is necessary to modify the application each time the meta information increases.
[0024]
The present invention has been made in view of the above circumstances, and even if an object-oriented structured document database does not have a function of storing meta information, the addition, change, and deletion of meta information can be performed without depending on an application program. It is an object of the present invention to provide a storage search device, a storage search method, a storage search program, and a storage search program recording medium that can flexibly cope with the following.
[0025]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1 is a storage and retrieval device for accessing an object-oriented structured document database based on an instruction from an application program and performing information processing. Setting information storage means for storing information relating to the path of the meta information of the structured document stored in the object-oriented structured document database, and the object-oriented structured document received under a storage instruction from the application program; In addition to storing in the structured document database, the meta information received from the application program is inserted into the stored structured document according to the information on the path of the meta information stored in the setting information storage means, and expanded. Storage means for storing as a structured document The structured document corresponding to the extended structured document stored in the object-oriented structured document database in accordance with a search instruction from the application program and information on the path of the meta information stored in the setting information storage unit. Or a search unit for separating and acquiring the meta information.
[0026]
According to a second aspect of the present invention, in the first aspect of the present invention, the search unit obtains the document having the structure based on a comparison between a path search expression as the search instruction and information on the path of the meta information. It is determined whether the document is a structured document or the meta information, and if the result of the determination is a structured document, the meta information inserted by the storage unit is removed from the acquired document.
[0027]
The present invention according to claim 3 is a storage and retrieval method of a storage and retrieval device that accesses an object-oriented structured document database based on an instruction from an application program and performs information processing, wherein the object-oriented structure is stored together with a structured document. Setting information storing step of storing information about a path of meta information of the structured document stored in the structured document database; and storing the structured document received under a storage instruction from the application program in the object-oriented structured document. The meta information received from the application program is inserted into the stored structured document according to the information on the path of the meta information stored in the setting information storing step, and is stored as an extended structured document. Storing step; According to a search instruction from the application program and information on the path of the meta information stored in the setting information storage step, the structured document or the extended structured document corresponding to the extended structured document stored in the object-oriented structured document database. And a search step of separating and acquiring the meta information.
[0028]
According to a fourth aspect of the present invention, in the third aspect of the present invention, in the searching step, based on a comparison between a path search expression as the search instruction and information on the path of the meta information, the document to be obtained has the structure It is determined whether the meta information is a structured document or the meta information, and if the result of the determination is a structured document, the meta information inserted in the storing step is removed from the acquired document.
[0029]
According to a fifth aspect of the present invention, there is provided a storage and retrieval program for causing the storage and retrieval device according to the third or fourth aspect to execute the above-described steps.
[0030]
According to a sixth aspect of the present invention, there is provided a storage and retrieval program recording medium which records the storage and retrieval program according to the fifth aspect on a computer-readable recording medium.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0032]
FIG. 1 is a schematic configuration diagram of a storage and retrieval system 1 according to an embodiment of the present invention. The storage / retrieval system 1 shown in FIG. 1 includes an application 100, a storage / retrieval device 200, and an object-oriented structured document database (hereinafter, referred to as a database) 300. The storage / retrieval system 1 may have any configuration such as a single device or a system in which each component is distributed and a plurality of devices are connected to a network.
[0033]
The application 100 is an application program that uses the storage / retrieval apparatus 200, and is an application program that needs to store a structured document in a database and search for the structured document during the processing. Here, the search formula used for searching the structured document is the above-described path search formula.
[0034]
The storage / retrieval apparatus 200 has a function of storing the structured document and the meta information passed from the application 100 in the database 300, and a function of storing the structured document and the meta information stored in the database 300 with the path search formula passed from the application 100. And a function of returning a search result to the application 100.
[0035]
The database 300 is an object-oriented structured document database that stores structured documents, and has the three functions of the above-described tree structure acquisition function, tree structure operation function, and path search function.
[0036]
More specifically, the storage / search device 200 includes a control device 201, a setting information dictionary 202, a storage device 203, and a search device 204.
[0037]
When receiving the path search formula from the application 100, the control device 201 controls the other devices 202 to 204 and returns the search result to the application 100.
[0038]
The setting information dictionary 202 is a dictionary that stores setting information that determines the operation of the storage / retrieval apparatus 200.
[0039]
The storage device 203 receives the structured document and the meta information from the control device 201 and stores them in the database 300.
[0040]
The search device 204 receives the path search formula from the control device 201, executes a search on the database 300, and returns a return result to the control device 201.
[0041]
Note that the setting information stored in the setting information dictionary 202 includes a meta information path P indicating where to add the meta information to the structured document stored in the database 300.
[0042]
Next, the operation of the storage and retrieval system 1 according to the present embodiment will be described with reference to FIGS. Here, FIG. 2 is a flowchart illustrating a processing procedure of the storage / retrieval system 1. FIG. 3 to FIG. 5 are flowcharts illustrating the steps S100, S200, and S300 of FIG. 2 in detail.
[0043]
As shown in FIG. 2, the storage / search system 1 first sets a dictionary, and then stores a structured document or searches for a structured document according to an instruction from the application 100 (steps S100 to S100). S400). When processing a plurality of structured documents, step S100 is first performed only once, and thereafter, steps S200 and S300 are repeated for each structured document in an arbitrary order.
[0044]
Here, each of the above steps will be described. First, the dictionary setting step S100 will be described with reference to FIG.
[0045]
The user sets a meta information path set P which is a list of the above meta information paths P._1-nIs generated (step S101), and the generated meta information path set P_1-nIs input to the setting information dictionary 202 (step S102).
[0046]
Next, the structured document storage step S200 will be described with reference to FIG.
[0047]
The application 100 stores the structured document D and the meta information set M_1-nIs generated and input to the control device 201 to instruct storage of a structured document (step S201). The meta information M_iIs the path P_iIs meta information corresponding to.
[0048]
The control device 201 inputs the structured document D input in step S201 to the storage device 203, and instructs storage of the structured document (step S202).
[0049]
The storage device 203 inputs the structured document D input in step S202 to the database 300, and instructs insertion of all documents (step S203).
[0050]
The database 300 executes the entire document insertion using the structured document D input and specified in step S203 (step S204).
[0051]
Next, the control device 201 sets the meta information set M input in step S201._1-n, And the meta information path set P extracted from the setting information dictionary 202_1-nIs input to the storage device 203 to instruct the storage of the meta information (step S205).
[0052]
The storage device 203 stores the meta information M input in step S205._iTo the meta information path P_iTo the database 300 according to the above, and instruct the insertion of the partially structured document (step S206).
[0053]
The database 300 stores the meta information M input and specified in step S206._i, And meta information path P_i(Step S207). At this time, the meta information path P_iMeta information M at the position indicated by_iInsert
[0054]
Next, the structured document search step S300 will be described with reference to FIG.
[0055]
The application 100 generates a path search formula Q for acquiring a structured document or meta information from the database 300 (Step S301). At this time, the conditions of the path search formula Q include the structured document D and the meta information set M_1-nCan be specified.
[0056]
The application 100 inputs the path search formula Q generated in step S301 to the control device 201, and instructs execution of the search (step S302).
[0057]
The control device 201 inputs the path search formula Q input in step S302 to the search device 204, and instructs execution of the search (step S303).
[0058]
When the search device 204 inputs the path search expression Q input in step S303 to the database 300 and instructs the search device to execute the search, the database 300 executes the search, and sends the node set N to the search device 204._1-mIs returned (step S304).
[0059]
The search device 204 determines the node set N returned in step S304._1-mIs returned to the control device 201 (step S305).
[0060]
The control device 201 obtains the meta information path set P from the setting information dictionary 202._1-nAnd obtains the meta information path set P_1-nAnd the path P obtained by removing the condition from the path search expression Q_QIs compared with (step S306). This is, specifically, a meta information path set P_1-nAll meta information paths P in_kAbout the path P_QIs the meta information path P_kIt is determined whether or not it points to itself or its descendant nodes. Pass P_QIs the meta information path P_kIf it does not indicate itself or its descendant nodes, the path search expression Q is regarded as indicating the partially structured document set of the structured document D, and step S308 is executed. On the other hand, the path P_QIs the meta information path P_kWhen pointing to itself or its descendant nodes, the path search expression Q_1-nIs regarded as indicating the partial structured document set, and step S309 is executed (step S307).
[0061]
Pass P_QIs the meta information path P_kIf the control device 201 does not indicate itself or its descendant nodes, the control device 201 returns to the node set N returned in step S305._1-mIndividual nodes N_j, A partial structured document acquisition is executed (step S308). To obtain a partially structured document, the node N_jThis is done by acquiring all the following descendant nodes and assembling them into a structured document. However, at this time, the meta information path set P_1-nIs obtained, and the nodes corresponding to these paths are not obtained. Node N generated by this_jA partially structured document having the_jAnd Finally, the node set N_1-mGenerates a partially structured document for all nodes of the_1-mGet.
[0062]
On the other hand, the path P_QIs the meta information path P_kWhen pointing to itself or its descendant nodes, the control device 201 returns the node set N returned in step S305._1-mIndividual nodes N_j, A partial structured document acquisition is executed (step S309). To obtain a partially structured document, the node N_jThis is done by acquiring all the following descendant nodes and assembling them into a structured document. Node N generated by this_jA partially structured document having the_jAnd Finally, the node set N_1-m, A partially structured document is generated, and a partially structured document set E is generated._1-mGet.
[0063]
The control device 201 transmits the partially structured document set E generated in step S308 or S309._1-mIs returned to the application 100 (step S310).
[0064]
Next, specifically, storage in the case of using an XML (extensible Markup Language) as a structured document and a database (hereinafter, referred to as an XML DB) that supports XPath (XML Path Language) as a path search expression is used. -The search system 1 will be described.
[0065]
This storage / retrieval system 1 performs the operation shown in the flowchart of FIG. 2 described above. Here, in the actual processing, steps S200 and S300 are repeated a required number of times in an arbitrary order according to the purpose of use of the application 100 and the operation of the user. However, for the sake of explanation, steps S100 to S300 are performed only once. I do.
[0066]
First, the dictionary setting step S100 will be described with reference to FIG.
[0067]
The user inputs the meta information path P shown in FIG.₁And P₂Meta information path set P that is a list of_1-2Is generated (step S101).
[0068]
Then, the user sets the meta information path set P generated in step S101._1-2Is set in the setting information dictionary 202 (step S102).
[0069]
Next, the structured document storage step S200 will be described with reference to FIG.
[0070]
The application 100 includes a structured document D shown in FIG. 7 and a meta information set M shown in FIG._1-2Is generated and input to the control device 201 to instruct storage of a structured document (step S201). The meta information M_i(I = 1, 2) is the path P_iThis is meta information corresponding to (i = 1, 2).
[0071]
The control device 201 inputs the structured document D input in step S201 to the storage device 203, and instructs storage of the structured document (step S202).
[0072]
The storage device 203 inputs the structured document D input in step S202 to the database 300, and instructs insertion of all documents (step S203).
[0073]
The database 300 executes the entire document insertion using the structured document D input and specified in step S203 (step S204). FIG. 9 shows the structure of the stored structured document D in the database.
[0074]
The control device 201 sets the meta information set M input in step S201._1-2, And the meta information path set P extracted from the setting information dictionary 202_1-2Is input to the storage device 203 to instruct the storage of the meta information (step S205).
[0075]
The storage device 203 stores the meta information M input in step S205._iTo the meta information path P_iTo the database 300 to instruct insertion of a partially structured document (step S206).
[0076]
The database 300 stores the meta information M input and specified in step S206._i, And meta information path P_i(Step S207). At this time, the meta information path P_iMeta information M at the position indicated by_iInsert Inserted structured document D and meta information set M_1-2FIG. 10 shows the structure in the database. In FIG. 10, the meta information path P₁N₀₀₆Meta information M at the position₁Is the meta information path P₂N₀₀₇Meta information M at the position₂Is inserted.
[0077]
Next, the structured document search step S300 will be described with reference to FIG.
[0078]
The application 100 generates a path search formula Q shown in FIG. 11 for acquiring a structured document from the database 300 (Step S301). The path search formula Q shown in FIG. 11 specifies meta-information as a condition (the file name attribute of which is meta-information is “homepage1.xml”), and represents the acquisition of a partially structured document of the structured document D ( (A partially structured document under the path “/ RDF” is acquired.)
[0079]
The application 100 inputs the path search formula Q generated in step S301 to the control device 201, and instructs execution of the search (step S302).
[0080]
The control device 201 inputs the path search formula Q input in step S302 to the search device 204, and instructs execution of the search (step S303).
[0081]
When the search device 204 inputs the path search expression Q input in step S303 to the database 300 and instructs the search device to execute the search, the database 300 executes the search, and sends the node set N to the search device 204._1-mIs returned (step S304). Node set N to be returned_1-m(M = 1, N₁) Is shown in FIG.
[0082]
The search device 204 determines the node set N returned in step S304.₁Is returned to the control device 201 (step S305).
[0083]
The control device 201 uses the meta information path set P_1-2And the path P obtained by removing the condition from the path search expression Q_QAnd (Step S306). Path P in this example_QIs shown in FIG. Pass P_QIs the "RDF" node of the child node of the root node. Meta information path set P_1-2All meta information paths P in_kAbout the path P_QIs the meta information path P_kMeta information path P that is itself or its descendant node_kDoes not exist, the path search expression Q is regarded as returning a partially structured document set of the structured document D, and step S308 is executed (step S307).
[0084]
The control device 201 sets the node set N returned in step S305.₁Node N₁, A partial structured document acquisition is executed (step S308). To obtain a partially structured document, the node N₁This is done by acquiring all the following descendant nodes and assembling them into a structured document. However, at this time, the meta information path set P shown in FIG._1-2And do not obtain the nodes corresponding to these paths. Node N generated by this₁A partially structured document having the₁And In this specific example, the node set N₁Is the node N₁Node N₁More partially structured document set E₁Get. The partially structured document set E generated in FIG.₁Is shown. At this time, the meta information added to the tree structure in the database 300 becomes a partially structured document set E₁, Only the elements included in the original structured document D are output.
[0085]
The control device 201 transmits the partial structured document set E generated in step S308.₁Is returned to the application 100 (step S310).
[0086]
Next, the processing when the path search formula Q acquires meta information in step S307 will be described below.
[0087]
The application 100 generates a path search formula Q 'shown in FIG. 15 for acquiring a structured document from the database 300 (Step S301). The path search formula Q ′ specifies a structured document as a condition (the “/ RDF / Description / dc: creator” element of the structured document is “Kasuga”), and represents the acquisition of a partially structured document of meta information. (A partially structured document under the path “/ RDF / change_log / log” is acquired).
[0088]
The application 100 inputs the path search expression Q 'generated in step S301 to the control device 201, and instructs the execution of the search (step S302).
[0089]
The control device 201 inputs the path search expression Q ′ input in step S302 to the search device 204, and instructs execution of the search (step S303).
[0090]
The search device 204 inputs the path search expression Q 'input in step S303 into the database 300, and instructs execution of the search (step S304). The database 300 executes a search, and sends a node set N ′ to the search device 204._1-mIs returned. Node set N 'to be returned_1-m(M = 1, N ′₁) Is shown in FIG.
[0091]
The search device 204 determines the node set N ′ returned in step S304.₁Is returned to the control device 201 (step S305).
[0092]
The control device 201 obtains the meta information path set P from the setting information dictionary 202._1-2And the path P obtained by removing the condition from the path search expression Q_{Q '}And (Step S306). Path P in this example_{Q '}Is shown in FIG. Pass P_QIs the meta information set M₂Is a "log" node of the child node. Meta information path set P_1-2All meta information paths P in_kAbout the path P_QIs the meta information path P_kMeta information path P that is itself or its descendant node_kExists ("Meta information path P₂Applies), so that the path search expression Q 'is_1-2Is regarded as returning the partially structured document set, and the step S309 is executed (step S307).
[0093]
The control device 201 sets the node set N ′ returned in step S305.₁Node N '₁, A partial structured document acquisition is executed (step S309). Partial structured document acquisition is performed at node N '₁This is done by acquiring all the following descendant nodes and assembling them into a structured document. Node N 'generated by this₁Is converted to a partially structured document E '₁And In this specific example, the node set N '_1-Is a node N '₁Only node N ′₁More partially structured document set E '₁Get. The partially structured document set E 'generated in FIG.₁Is shown.
[0094]
The control device 201 transmits the partially structured document set E ′ generated in step S309.₁Is returned to the application 100 (step S310).
[0095]
Therefore, according to the storage / retrieval system 1 of the present embodiment, the storage / retrieval device 200 as middleware is used between the database 300 having no function of storing meta information and the application 100, so that the storage / retrieval system 1 is dependent on the application 100. Without doing so, it is possible to flexibly cope with addition, change, and deletion of meta information, so that it is possible to improve the convenience of system design and development.
[0096]
Specifically, when storing a structured document in the object-oriented structured document database, the meta information can be stored together. When searching the structured document, the structured document and the meta information can be stored. Can be obtained separately. In addition, when acquiring a structured document, it is possible to perform a search using meta information as a condition. When acquiring meta information, it is possible to perform a search using a structured document as a condition.
Note that the middleware program stored in the storage / retrieval apparatus 200 according to the above-described embodiment can be recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD-ROM. It is also possible to distribute via.
[0097]
【The invention's effect】
As described above, according to the present invention, even if the object-oriented structured document database does not have a function of storing meta information, it is possible to flexibly add, change, and delete meta information without depending on an application program. , A storage search method, a storage search program, and a storage medium storing a storage search program.
[0098]
This makes it possible to reduce the system development cost of a computer system that stores and retrieves structured documents and meta information using an object-oriented structured document database that does not have a function of storing meta information.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a storage / retrieval system according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an operation of the storage / retrieval system according to the embodiment of the present invention;
FIG. 3 is a flowchart showing a dictionary setting operation of the storage / search system according to the embodiment of the present invention.
FIG. 4 is a flowchart showing an operation of storing a structured document in the storage and retrieval system according to the embodiment of the present invention.
FIG. 5 is a flowchart illustrating a structured document search operation of the storage and search system according to the embodiment of the present invention.
FIG. 6 is an example of a meta information path.
FIG. 7 is an example of a structured document.
FIG. 8 is an example of meta information.
FIG. 9 is an example of a structured document stored in an object-oriented structured document database.
FIG. 10 is an example of a structured document stored in an object-oriented structured document database.
FIG. 11 is an example of a path search formula.
FIG. 12 is an example of a node set.
FIG. 13 is an example of a path.
FIG. 14 is an example of a partially structured document.
FIG. 15 is an example of a path search expression.
FIG. 16 is an example of a node set.
FIG. 17 is an example of a path.
FIG. 18 is an example of a partially structured document.
FIG. 19 is an example of a structured document.
FIG. 20 is an example of a structured document stored in an object-oriented structured document database.
FIG. 21 is an example of a retrieved partial structured document.
FIG. 22 is an example of a partially structured document to be inserted.
FIG. 23 is an example of a structured document stored in an object-oriented structured document database after insertion.
FIG. 24 is an example of a path search formula.
[Explanation of symbols]
1 Storage and retrieval system
100 applications
200 storage and retrieval device
201 Control device
202 Setting information dictionary
203 storage device
204 search device
300 Object-Oriented Structured Database

Claims (6)

A storage and retrieval device that accesses an object-oriented structured document database based on an instruction from an application program and performs information processing,
Setting information storage means for storing information about a path of meta information of the structured document stored in the object-oriented structured document database together with the structured document;
The structured document received under the storage instruction from the application program is stored in the object-oriented structured document database, and the meta information received from the application program is stored in the setting information storage unit. Storage means for inserting into the stored structured document according to the information on the path of the meta information, and storing as an extended structured document;
According to a search instruction from the application program and information on the path of the meta information stored in the setting information storage unit, the structured document corresponding to the extended structured document stored in the object-oriented structured document database or Search means for separating and acquiring the meta information,
A storage and retrieval device characterized by having: The search means,
Based on a comparison between the path search expression that is the search instruction and the information about the path of the meta information, it is determined whether the document to be obtained is the structured document or the meta information, and when the determined result is a structured document, 2. The storage and retrieval device according to claim 1, wherein said meta information inserted in said storage means is removed from the acquired document. A storage and retrieval method for a storage and retrieval device that accesses an object-oriented structured document database based on an instruction from an application program and performs information processing,
Setting information storing step of storing information on a path of meta information of the structured document stored in the object-oriented structured document database together with the structured document;
Storing the structured document received under the storage instruction from the application program in the object-oriented structured document database; and storing the meta information received from the application program in the setting information storing step. According to the information on the path of, the storage step of inserting into the stored structured document, and storing as an extended structured document,
According to the search instruction from the application program and the information on the path of the meta information stored in the setting information storing step, the structured document or the extended structured document corresponding to the extended structured document stored in the object-oriented structured document database A search step for separating and obtaining meta information;
A storage retrieval method, comprising: The search step includes:
Based on a comparison between the path search expression that is the search instruction and the information about the path of the meta information, it is determined whether the document to be obtained is the structured document or the meta information, and when the determined result is a structured document, 4. The storage retrieval method according to claim 3, wherein said step of removing said meta information inserted in said storing step from the acquired document. A storage retrieval program that causes the storage retrieval device according to claim 3 or 4 to execute each of the steps. A storage medium storing a storage search program according to claim 5, wherein the storage search program according to claim 5 is recorded on a computer-readable storage medium.

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