Showing papers by "Hiroyuki Kitagawa published in 2000"

X2QL: An eXtensible XML Query Language Supporting User-Defined Foreign Functions

Abstract: With the recent and rapid advance of the Internet, management of structured documents such as XML documents and their databases has become more and more important A number of query languages for XML documents have been proposed up to the present Some of them enable tag-based powerful document structure manipulation However, their contents processing capability is very limited Here, the contents processing implies the similarity-based selection, ranking, summary generation, topic extraction, and so on, as well as simple string-based pattern matching In this paper, we propose an extensible XML query language X2QL, which features inclusion of user-defined foreign functions to process document contents in the context of XML-QL-based document structure manipulation This feature makes it possible to integrate application-oriented high-level contents processing facilities into querying documents We also describe an implementation of an X2QL query processing systemon top of XSLT processors

Dynamic creation of multimedia Web views on heterogeneous information sources

Abstract: Integration of the World Wide Web and other information sources is strongly required in the recent advanced application environments. Although information sources contain various types of data objects, the volume of multimedia objects has been increasing drastically. The paper proposes a multimedia integration scheme using SMIL in a mediator based integration system. The scheme achieves dynamic creation of various Web views combining multimedia objects stored in heterogeneous information sources such as the Web, structured documents, and databases. A key point is to utilize SMIL as a framework for dynamic multimedia integration. Since there already exist some players for SMIL documents, dynamic integration results including multimedia objects can be rendered in such players, without special-purpose ones, and are ready to be broadly distributed. The main contributions of the paper are as follows. (1) We propose a dynamic, SMIL-based multimedia integration scheme. This scheme utilizes an extended relational data model named WebNR/SD. (2) We report on implementation of the proposed scheme. We have already implemented the first prototype system which realizes integration of heterogeneous information sources including multimedia objects. Actually, it can construct SMIL-based multimedia views dynamically. This shows the practical significance of our scheme.

Drag and Drop: Amalgamation of Authoring, Querying, and Restructuring for Multimedia View Construction

Abstract: Recently, it has been a matter of great importance to publish the multimedia data objects stored in various information sources. The World Wide Web is often used as publication media. In such context, a crucial point is how to present the results of the set-at-a-time operation (querying and restructuring of data in underlying information sources). Frameworks to specify how to query and restructure data are usually different from those to specify the presentation of the results in existing systems. This paper proposes a visual user interface which amalgamates authoring, querying, and restructuring functions for multimedia Web view construction. The user is only required to drag and drop data objects, just like in typical authoring tools for HTML and SMIL pages. A feature of our user interface is that the user can designate an existing data object as an example, which will serve as the representative of a set of data objects. Manipulation of an example is interpreted as manipulation of the set of data objects. Therefore, the object-at-a-time authoring framework and the set-at-a-time data manipulation (querying and restructuring) framework are integrated in a seamless way. Another feature is that the interface can cope with semistructured data, which often appear in the context of multimedia view construction. This paper also provides the formal semantics of data operations through the visual user interface.

A Rule-Oriented Architecture to Incorporate Dissemination-Based Information Delivery into Information Integration Environments

Abstract: Integration of heterogeneous information sources has been one of important research issues in recent advanced application environments. Today, various types of information sources are available. Dissemination-based information delivery services that autonomously deliver information from the server sites to users are among the useful and promising information sources. In this paper, we present incorporation of dissemination-based information delivery into information integration environments. The integration here has two goals: (1) Users can utilize dissemination-based information services as other information sources such as databases and the Web. Namely, they can be sources of information integration. (2) Users can obtain integrated information through dissemination-based delivery. We explain this requirement can be met by a combination of an information integration engine and event-driven rule processing scheme. We also explain prototype system development.

Xml document inquiry language processor

Abstract: PROBLEM TO BE SOLVED: To provide an XML document inquiry language processor which can make the processing operation of description contents flexible and high-grade without changing an existing inquiry language taking XML documents as the object. SOLUTION: The processor is provided with an inquiry means 1 which makes an inquiry about document data described in an XML document form, a conversion means 4 which analyzes the inquiry to convert it into an internal form, an execution means 5 which executes inquiry contents on the basis of the converted internal form to output document data, and an external function preservation means 6 where external functions which are described in a general programming language and are used for processing which cannot be performed by description contents processing of the query language are preserved, and the inquiry means 1 is provided with an external function definition means which defines external functions while making processing contents described in the general programming language correspond to processing contents described in the XML language in order to performing processing in accordance with a program described in external functions. When an external function is designated in the inquiry, the execution means 5 calls the external function to execute a processing described in the general programming language. COPYRIGHT: (C)2001,JPO

Agent-based processing of navigational queries in infoweaver

Abstract: We are developing InfoWeaver, an information integration system for the Web, relational databases, and structured document repositories. To collect Web pages required for integration, InfoWeaver deals with navigational queries. In this paper, we present design and evaluation of query processing scheme for navigational queries. In general, navigational queries can cause very lagre data transfer cost if all the necessary pages are transferred to the system. To alleviate this problem, our proposed scheme uses distributed agents, named navigators. They cooperatively take part of the system's functions at Web server sites, to reduce the cost of Web page transfer. This paper includes experimental results on data transfer costs in this scheme.