• The Journal of Society for e-Business Studies
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• v.8 no.3
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• pp.131-141
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• 2003

For workflow systems using XML documents for saving workflow process definition and especially for XML-based worflow systems, a repository needed to provide control for XML documents. The repository allows uniform access to shared data and facilitates integration among tools in workfolw systems. An XML repository gives the best solution to maintain, exchane, and modify the workflow process definition meta data, which is in the form of XML documents . The XML repository, where users can lookup the worflow definition objects, serves as the metadata foundation of the workflow system. In this paper, we developed for XML Repository(called REPOWO : REPOsitory for Workflow) that can store, delete, search and transform XML documents. REPOWO is implemented by combining EJB components based on RDBMS. By REPOWO, workfolw process definitions, data type definitions and transition informations can be easily manage.

• Journal of Internet Computing and Services
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• v.3 no.3
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• pp.75-85
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• 2002

Nowadays for reliable software and cost reduction there are many research works on software development based on component, One of the challenge in designing a component-based system is determining which components are required and where they fit in the overall system architecture. In this paper, we developed three EJB components, the first is for transforming XML DTD to relational database schema, the second is for storing XML document in relational database, and the third is for transforming XML document by retrieving relational database, By assembling these three components, we developed XML Repository system finally.

• International Journal of Contents
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• v.3 no.3
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• pp.6-14
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• 2007

In this paper, we design and implement a XML Repository System(XRS) that exploits the advantages of DBMSs and IRSs. Our scheme uses BRS to support full text indexing and content-based queries efficiently, and ORACLE to store XML documents, multimedia data, DTD and structure information. We design databases to manage XML documents including audio, video, images as well as text. We employ the non-composition model when storing XML documents into ORACLE. We represent structured information as ETID(Element Type Id), SORD(Sibling ORDer) and SSORD(Same Sibling ORDer). ETID is a unique value assigned to each element of DTD. SORD and SSORD represent an order information between sibling nodes and an order information among the sibling nodes with the same element respectively. In order to show superiority of our XRS, we perform various experiments in terms of the document loading time, document extracting time and contents retrieval time. It is shown through experiments that our XRS outperforms the existing XML document management systems. We also show that it supports various types of queries through performance experiments.

• The Journal of Information Technology
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• v.4 no.4
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• pp.89-100
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• 2001

XML (extensible Markup Language) is selected and published as a representative standard of electronic documents by W3C (World Wide Web Consortium). The structured information can be created and also transferred in XML documents. By utilizing XML, you can express the meaningful information unit as a structure comparing existed file typed information. With structured information, you can also manage retrieve, and reposit documents. According to the above facts, in this paper, it is the purpose to design and implement XML documents repository system to reposit and retrieve using structured information of XML documents. As a model it was designed to be stored by element unit which is the basic unit of documents and was also designed to retrieve the stored XML information by structured unit. It was, especially, designed to manage and reposit the structure of various documents effectively through creating schema as to DTD(Document Type Definition) and instance.

• Journal of Internet Computing and Services
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• v.4 no.2
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• pp.47-60
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• 2003

As XML has been used as a markup language for standard documents in various areas, it requires an XML editing tool which writes XML documents easily and presents the style of documents. Therefore, many companies have developed XML editing tools and have released the products. However, it is hard for beginners to write XML documents using such tools. In this paper, we design and implement an XML editor based on WYSIWYG(What You See Is What You Get) that beginners as well as exports can use easily. Our XML editor allows beginners to write easily XML documents and style documents. We also integrate our XML editor with the XML repository system developed in our laboratory.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.703-706
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• 2000

In recent years. XML applications are being developed in diverse area. Especially, development of XML document repository system associated with database is carrying out widely. The previous researches of XML repository system have several defects which are update and retrieval limitations for the XML document, design limitation for a formal retrieval algorithm and data redundancy. In order to solve the above problems. in this paper, we suggest relational database schemes for overcoming limitations of updating, retrieving, and rebuilding document. And suggest query translation strategy using two-phase translation that consists of pattern analyzing phase and SQL generating phase.

• The Journal of Korean Association of Computer Education
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• v.6 no.4
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• pp.11-21
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• 2003

In rapidly changing an information=oriented society, it is essential to control massive document information by electronic file. In relation to these electronic document, it is also important to keep and maintain all kinds of information without any losses. It should be allowed to trace previous contents as well as recently updated contents by controlling updated contents with version. For these, XML is recommendable. In this thesis, we intend to save the document storing space by saving only updated contents with version without saving whole documentation, when document is updated. In case of controlling the history of document update by version, we designed system so as to omit "JOIN operation" if document size is under a certainspecific size. Therefore, we implemented a new XML document repository system which is possible for quick search and efficient XML document saving by reducing perfomance deterioration caused by JOIN operation.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.3
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• pp.332-340
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• 2003

XML is an emerging internet standard for data representation and exchange on the web. Recently, many researches on storing XML documents are in progress. Since XML documents have an implicit semantic schema, it is difficult to store XML data into a DBMS or File System. This paper introduces XDOM, object repositories for the DOM object, which stores an object for persistency support. As XDOM does not require the burdensome design of a fixed schema unlike the legacy DBMS, can store schema-less XML documents. And it can help XML applications to access the DOM object transparently from the object repositories below memory. XDOM introduced in this paper is implemented in pure Java and evaluated using experiments.

• The KIPS Transactions:PartD
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• v.9D no.1
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• pp.1-10
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• 2002

Metadata is data about data that is used to mange data itself. As applications based on DBMS are increased, it is suggested that metadata model and metadata interchange model to manage metadata in DBMS. but metadata which is in the form of XML (eXtensible Markup Language) document is generally stored into RDBMS. Therefore In this paper, as for the method to store metadata of RDBMS into OODBMS, we design metadata model, metadata interchange model and implement new repository system. The metadata of RDBMS is translated into in the form of XML Document and integrated into XML Data Server on OODBMS, eXcelon and executes retrieval metadata information about RDBMS by XQL(XML Query Language). So It is possible to searchm edit a metadata. The metadata of XML documents stored in eXcelon is easily made to be printed in web browser by applying a XSL (extensible StyleSheets Language). So we can have a detail information about property of metadata in DBMS.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.36-38
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• 1999

본 논문에서는 대용량의 XML 문서를 효과적으로 저장, 관리 및 구조 기반 검색이 가능한 XML 저장관리시스템을 설계하고 구현한다. 구현한 XML 저장관리시스템은 관계형 모델을 기반으로 하고, XML 문서 전체를 저장하는 비분할 저장 모델을 사용하며, DTD에 따라 스키마가 생성되는 동적 스키마 생성 모델을 특징으로 한다. 본 논문의 XML 저장관리 시스템은 BRS 검색엔진과 ORACLE을 기반으로 하며 질의처리기 및 검색결과생성기, XML 객체관리자, XML 인덱스관리자, 구조검색엔진 등으로 구성된다. 이를 통하여 내용 및 애트리뷰트 검색 뿐만 아니라 다양한 구조 정보검색을 효율적으로 지원한다.