• Journal of Internet Computing and Services
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• v.11 no.6
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• pp.123-133
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• 2010

XML has been become the new standard for publishing and exchanging data on the Web. However, most business data is still stored and maintained in relational database management systems. As such, there is an increasing need to efficiently publish relational data as XML data for Internet-based applications. The most important issue in the transformation is to reflect structural and semantic relations of RDB to XML schema exactly. Most transformation approaches have been done to resolve the issue, but those methods have several problems. In this paper, we discuss algorithm in transforming a relational database schema into corresponding XML schema in XML Schema. We aim to achieve not only explicit/implicit referential integrity relation information but also high level of nested structure while introducing no data redundancy for the transformed XML schema. To achieve these goals, we propose a transformation model which is redundancy free and then we improve the XML Schema structure by exploring more nested structure.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.374-377
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• 2000

본 논문에서는 기존의 항만물류 EDI가 가진 문제점을 해결하기 위한 방안으로 제시된 XML/EDI 에 대해 살펴보고 항만 물류에 XML/EDI를 적용하기 위해 기존의 EDI 메시지를 XML Schema 로 변환하는 기법을 소개한다. XML 문서의 논리적 구조를 표현하는 방법은 크게 DTD(Document Type Definition) 와 XML Schema 의두 가지 방식이 있으며,k XML Schema 는 기존의 DTD 에 비해 다양한 데이터 타입의 지원, namespace 지원, open-ended 데이터 모델의 지원등 여러 장점이 있기 때문에 항만 EDI 메시지를 XML Schema 로 변환하면 DTD 로 변환하는 것에 비해 높은 표현력과 다양한 부가적인 처리를 지원할 수 있다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.04a
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• pp.536-542
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• 2004

XML이 웹 상에서 문서 교환의 표준으로 자리잡고 있으며 그 수요가 나날이 증가하고 있다. 그에 따라 XML 데이터나 문서 구조를 모델링하는 XML Schema(W3C XML Schema Spec) 또한 수요가 증가하고 있다. 그러나 XML Schema는 다양한 자료형과 풍부한 표현력을 제공하지만 그 복잡성으로 인해 모델링하기가 어려운 단점이 있다. 본 논문에서는 관계형 데이터베이스 설계의 기본적인 도구인 개체-관계 모델을 이용하여 Ut Schema를 간단하게 생성하는 방법을 제시한다. 개체-관계 모델과 변환 될 XML Schema의 구조는 서로 일대일로 매핑되지 않아 직접 변환할 수는 없다. 그래서 몇 가지 알고리즘을 이용하여 개체-관계 모델을 계층적 구조모델로 변환을 한다. 이렇게 변환된 계층적 구조 모델을 이용하여 최종적으로 XML Schema를 생성한다. 여기서 제시한 알고리즘의 특징은 XML Schema의 중요한 특성들인 재사용성, 전역 및 로컬 기능 등을 가진 문서를 생성한다는 것이다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.10-12
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• 2002

XML이 널리 확산되면서 XML문서들을 관계형 데이터 베이스에 저장하기 위한 관계형 스키마의 생성이 더욱 중요해 지고 있다. 기존의 DTD기반 관계형 스키마 생성 기법은 XML Schema에 적용될 수 없는데, 그 이유는 XML Schema에는 다양한 데이터 타입, 상속, 다형성과 같은 DTD에 존재하지 않는 새로운 특징들이 많기 때문이다. 이 논문은 XML 문서들의 구조를 정의한 XML Schema로부터 자동으로 관계형 스키마를 생성해 내는 XHL Schema를 위한 관계형 스키마 자동생성기의 개관을 설명한다

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11b
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• pp.984-989
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• 2003

최근 인터넷에서 문서 포맷의 기준으로 XML이 각광을 받고 있으며 XML schema를 통하여 DTD에서는 할 수 없었던 부분을 할 수 있게 되었다. 또한 e-카탈로그에서 XML 문서의 사용이 급증하면서 XML 문서의 설계가 점차 복잡해지고 XML schema 설계가 DTD보다 한층 더 복잡하게 되었기 때문에 XML schema 모델링이 중요한 문제로 대두 되었다. 이에 본 논문에서는 복잡한 XML 문서를 체계적이고 구조화하기 위하여 XML 문서를 UML로 설계하고 UML 모델링 정보를 변질과 누락 없이 추출하기 위하여 REI를 이용하여 UML 모델링 정보를 추출하여 XML로 변환하였다.

• Journal of Internet Computing and Services
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• v.4 no.4
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• pp.35-44
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• 2003

XML becomes the standard for exchanging documents and data on the Web. Schema is used to define XML documents. Among schema, XDR schema, developed chiefly by Microsoft, is a leading schema for practical use. UML is a notation in object-oriented software development and a useful tool to represent the structure of a system. In this paper, we study the transformation method and algorithm from XDR schema to UML diagram. By this transformation, the structure of XDR schema is represented graphically. Thus we can easily understand the structure of XDR schema and we can create XML documents effectively by enhancing reusability and flexibility.

• Journal of Computing Science and Engineering
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• v.4 no.4
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• pp.313-349
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• 2010

In this paper, we study the data interoperability problem of web services in terms of XML schema compatibility. When Web Service A sends XML messages to Web Service B, A is interoperable with B if B can accept all messages from A. That is, the XML schema R for B to receive XML instances must be compatible with the XML schema S for A to send XML instances, Le., A is a subschema of B. We propose a formal model called Schema Automaton (SA) to model W3C XML Schema (XSD) and develop several algorithms to perform different XML schema computations. The computations include schema minimization, schema equivalence testing, subschema testing, and subschema extraction. We have conducted experiments on an e-commerce standard XSD called xCBL to demonstrate the practicality of our algorithms. One experiment has refuted the claim that the xCBL 3.5 XSD is backward compatible with the xCBL 3.0 XSD. Another experiment has shown that the xCBL XSDs can be effectively trimmed into small subschemas for specific applications, which has significantly reduced the schema processing time.

• Convergence Security Journal
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• v.7 no.3
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• pp.79-86
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• 2007

B2B e-business is an economic transaction formed between companies through various networks including internet. At present, e-business between companies partly applies information distribution between companies, but many enterprises expect that a corporate basic system will be gradually changed into XML basis if web service is earnestly materialized, so they are competing with each other in developing XML DBMS. Existing XML DBMS studies used XML DTD in order to represent the structure of XML document. Such XML DTD defines the expression of a simple type, so there are many difficulties in defining the structure of XML document. To cope with this, in this paper, the author will develop database schema generator utilizing relational database generally used in storing contents of data, on the basis of XML schema selected as a standard of W3C. Also, to store XML data, the author proposed the automatic conversion method of relational database schema that used XML schema.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.4 no.2
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• pp.129-134
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• 2004

XML is the new universal format for structured documents and data on the World Wide Web. As the Web becomes a major means of disseminating and sharing information and as the amount of XML data increases substantially, there are increased needs to manage and design such XML document in a novel yet efficient way. Moreover a demand of XML Schema(W3C XML Schema Spec.) that verifies XML document becomes increasing recently. However, XML Schema has a weak point for design because of its complication despite of various data and abundant expressiveness. Thus, it is difficult to design a complex document reflecting the usability, global and local facility and ability of expansion. This paper shows a simple way of modeling for XML document using a fundamental means for database design, the Entity-Relationship model. The design from the Entity-Relationship model to XML Schema can not be directly on account of discordance between the two models. So we present some algorithms to generate XML Schema from the Entity-Relationship model. The algorithms produce XML Schema codes using a hierarchical view representation. An important objective of this modeling is to preserve XML Schema's object-oriented concepts such as reusability, global and local ability. In addition to, implementation procedure and evaluation of the proposed design method are described.

• The KIPS Transactions:PartD
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• v.10D no.3
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• pp.367-374
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• 2003

A mediator-wrapper system, which is one of integration methods of heterogeneous databases, preserves a virtual integrated view rather than physical movement of the contents of each database. In order for a mediator to preserve a virtual integrated view, it requires the schema manager of the wrapper which communicates with local databases. This paper presents a schema manager of a wrapper that provides a mediator with XML schema which is generated from relational database schema. The XML schema manager supports a user-defined XML view. We present the view tree model which is used for materializing the use-defined XML view to generate XML schema, and the conversion algorithm based on the proposed view tree model. This model is can be uniformly applied to all schema managers of heterogeneous information sources.