• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.11b
• /
• pp.351-354
• /
• 2002

데이터로서 XML의 의미가 중요해짐에 따라 XML 문서를 저장하는 방법들에 대한 연구가 활발히 진행되고 있다. 그 중 하나가 스키마를 이용하여 XML 문서를 관계형 데이터베이스에 저장하는 것으로서, 지금까지 DTD를 중심으로 연구가 이루어져 왔으나, XML 스키마의 등장으로 DTD의 단점을 보완하고, 기존 관계형 데이터베이스와 보다 유사하게 표현 할 수 있게 되었다. 본 논문에서는 XML 스키마에서 관계형 스키마를 추출하는 기법을 제시한다. 제시된 기법은 DTD에서 관계형 스키마를 추출하는 기법을 기반으로 하여, DTD에서 표현할 수 없는 사용자 정의 데이터형을 추가로 제공하는 등, XML 스키마의 속성과 요소에 따른 여러 특성을 표현할 수 있다.

• Journal of the Korea Computer Industry Society
• /
• v.3 no.7
• /
• pp.831-836
• /
• 2002

There are various information resources on the Internet and people are taking more interest in XML day by day. In XML, the structure of information can be freely defined so that the standardization of documents can be hardly made. If DTD, which is applied to an XML Document representing specific information, is including concept information, it can be freely applied to the structure of document and also contributes to the convenience in information retrieval. In this study, we developed universal DTD Generator in order to automatically generate DTD including concept information. For the generation of universal DTD, the conceptualization of information is required; to conceptualize information, the hierarchical structuring and propertizing are required. The hierarchical structuring represents the inclusive relation of routine concepts for representing information in hierarchical structure, and the propertizing represents the property and mutual relation that the each concept represented in hierarchical structure can have. The defined hierarchical structure and propertization come to generate the universal DTD Generator. The universal DTD generated by DTD Generator can be applied to all the XML Documents representing the same information in different structure. However, the most ideal way is that the information of universal DTD, which can be applied to various documents, is including all the cases. Therefore, the study for designing correct concept information is necessary.

• Journal of Internet Computing and Services
• /
• v.3 no.1
• /
• pp.29-40
• /
• 2002

The information exchange on the using of XML such as B2B electronic is common. So the efficient method to store XML message in database is needed. Because the ORDBMS is extended to ORDBMS for supporting multimedia application such as Oracle8i, 9i, Informix and SQL2000 server, SQL2, the standard RDB is extended to SQL3 for ORDB, And the XML application based on java such as J2EE is extended. Therefor it is necessary for the efficient connection methods based on JDBC between XML application and database system. In this paper, the methodology a transformation XML DTD to SQL3 schema is proposed. For the transformation, first the methods of transformation XML DTD to object model in UML class diagram are proposed. And then the methods of mapping transferred object models to SQL3 schema are proposed. This approach for transform::1lion XML. DTD to SQL3 schema such as Oracle8i, 9i, Informix and SQL2000 server based on java is proposed in this paper, can be used in database design to build XML applications based on ORDB.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10b
• /
• pp.626-628
• /
• 1998

XML은 사용자가 각 응용에 따라 필요한 태그 집합과 문서 구조를 정의할 수 있는 효과적인 기반을 제공 하지만, 서로 다르게 정의되는 태그는 그 이름만으로는 정확한 의미를 식별하기가 어렵다. 본 논문에서는 데이터 레지스트리에 기반 하여 DTD를 작성함으로써 XML 태그에 문맥적인 의미를 부여하는 방법을 제시하였으며, 이를 지원하는 DTD 작성도구를 설계하였다. XML의 기능에 데이터 레지스트리가 제공하는 표준화된 의미를 추가시킴으로써 DTD에 독립적인 문서 교환이 가능하며, 태그의 의미를 이용한 문서의 검색을 효과적으로 수행할 수 있다.

• Proceedings of the Korea Contents Association Conference
• /
• 2003.11a
• /
• pp.285-289
• /
• 2003

In this paper, we present DTD-dependent object database schema design methods to efficiently store XML data and process path expression. The similarity between DTD graph model and the object database model, and the characteristics of object database, object references and set-valued attributes, are very profitable to store XML documents into object databases. We propose two kinds of schema design methods. We then compare and anayze space and time complexity for the methods.

• Journal of the Korean Society for information Management
• /
• v.16 no.4
• /
• pp.37-52
• /
• 1999

In this paper, we propose a technique to represent a sheet music effectively on the Internet. For representing the Internet sheet music, this paper proposes the ScoreML(Score Markup Language) which is a new markup language based on XML, and describes the design of the XML DTD which defines the ScoreML. XML DTD constructing the ScoreML is designed to be able to represent various features of a sheet music in order to retrieve the real sheet music on the Internet. The sheet music built by the ScoreML is directly displayed on the Internet by ScoreML browser which is implemented in the form of Java applet.

• The KIPS Transactions:PartD
• /
• v.9D no.6
• /
• pp.999-1008
• /
• 2002

XML is emerging as a standard data format to exchange and to present data on the Web. There are increasing needs to efficiently store and to query XML data. In this paper. we propose a new schema transformation algorithm based on a common structure extracting technique from XML documents. The common structure is shared by all XML documents referenced by DTD and the uncommon structure is ununiformly appeared on all XML documents referenced by DTD. Based on the extracted common and uncommon structures, we transform XML DTD into relational database schema. We conduct a performance evaluation based on the number of the generated tables, the size of the record, query processing time and the number of joins on the query. The performance of our algorithm is compared with the existing algorithms, then in most cates, our algorithm is better than the existing ones with respect to the number of the generated tables and appearance of NULL values in the tables.

• Journal of Industrial Technology
• /
• v.21 no.A
• /
• pp.141-146
• /
• 2001

XML is fast emerging as the dominant standard to represent and exchange data in the Web. As the amount of data available in the Web has increased dramatically in recent years, the data resides in different forms ranging from semi-structured data to highly structured data in relational database. As semi-structured data will be represented by XML, XML will increase the ability of semi-structured data. In this paper, we propose an idea for extracting schema in XML document using DTD.

• Proceedings of the Korean Information Science Society Conference
• /
• 2001.04b
• /
• pp.133-135
• /
• 2001

데이터로서 XML 역할에 대한 중요성이 증대되어감에 따라, 구조 정보를 내포하고 있는 데이터로서의 XML 문서를 효과적으로 관리하는 구조설계 및 질의어 처리에 대한 연구가 활발히 진행되고 있다. XML 저장구조는 XML 스키마에 의존하지 안고, 반구조적 데이터에 대한 저장과 질의처리 설계방법과 DTD와 같은 XML 스키마를 기반으로 저장구조를 설계하는 방법이 있다. DTD는 XML 문서의 논리적인 구조정보를 표현하는 역할을 가지고 있으며, 그러한 역할은 이 기종간의 문서교환시 더욱 중요해진다. DTD 기반의 XML문서를 관계형 테이블로 사상하고자 할 때, 사상과정이 자동적으로 이루어지는 경우와 사용자가 관리자가 직접 테이블 생성에 관여하는 수동적인 사상방법이 있다. 수동적인 사상과정은 질의처리가 구현시 데이터베이스 설계 방법에 크게 의존하게 되는 단점이 있지만, 사용자가 주어진 DTD 구조에 따라서 특정 응용에 알맞은 저장구조를 직접 설계하기 때문에 더 효율적인 저장구조를 설계할 수 있다. 본 논문에서는 관계형 DB를 질의처리 하기 위한 하부 저장소로 사용하고, DTD 기반의 XML 문서를 관계형 DB 테이블간의 수동적인 사상과정을 통하여 효율적인 XML 문서 저장구조를 설계하는 방법을 제시한다.

• The Journal of Information Technology and Database
• /
• v.8 no.1
• /
• pp.105-116
• /
• 2001

XML is a standard markup language for exchange and storage of formed or well-formed information in World Wide Web. Because the source data of XML message for exchange of information in World Wide Web is stored in legacy database, it is necessary for the easy connection between XML application and database system. In Oracle8i, 9i, Informix and SQL2000, DBMS vendors make upgrade to DBMS for using XML. This method of upgrade between XML application and database system is Platform-dependent and DBMS-dependent. Also It is necessary for the method of the platform- and DBMS-independent connection between XML application and database system. The methods for the connection between XML DTD and RDB schema are studied for the easy connection between XML application and database system. But the study for the easy connection between XML DTD and ORDB schema is a little. For multimedia application, we use the extended DBMS from RDBMS. It is necessary for the study to the transformation from XML DTD to ORDB schema. In this paper, for easier connection between XML application and database system, we propose the method of the transformation from XML DTD to ORDB schema using Object Model.