• Title, Summary, Keyword: XML Schema

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An Efficient Validation Method for XML Data Updates (XML 데이타 갱신에 대한 효율적인 유효 검증 기법)

  • Lee, Ji-Hyun;Park, Myung-Jae;Chung, Chin-Wan
    • Journal of KIISE:Databases
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    • v.34 no.2
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    • pp.153-165
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    • 2007
  • XML is widely used in various applications as the standard for representing and exchanging data on the Web. XML Schema is the standard schema for XML and an XML document generated based on the XML Schema is called 'Valid XML document'. The XML Schema validity should be guaranteed after the XML document is updated. In this paper, we design an efficient method that verifies XML Schema validity before update, and so eliminates unnecessary validations. Also, we propose validation algorithms for each update. In addition, we propose the mapping between XML data and XML Schema and a storage method for XML Schema in order to efficiently extract the schema information for the validation. Finally, we compare the performance of the validation according to the storage methods.

ER2XML: An Implementation of XML Schema Generator based on the Entity-Relationship Model (ER2XML :개체-관계 모델을 기반으로한 XML Schema 생성기의 구현)

  • Kim Chang Suk;Son Dong-Cheul
    • The KIPS Transactions:PartD
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    • v.12D no.1
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    • pp.1-12
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    • 2005
  • The XML is emerging as standard language for data exchange on the Web. Therefore a demand of XML Schema(W3C MLL Schema Spec.) that verifies XML document becomes increasing. However, XML Schema has a weak point for design because of its complication despiteof various data and abundant expressiveness. This paper shows a simple way of design for XML Schema using a fundamental means for database design, the Entity-Relationship model. The conversion 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 automatic generation is to preserve XML Schema's characteristics such as reusability, global and local ability, ability of expansion and various type changes.

A Generation from Entity-Relationship Model to XML Schema Model (개체-관계 모델에선 XML Schema의 생성)

  • Kim, Chang-Suk;Kim, Dae-Su;Son, Dong-Cheul
    • Journal of Korean Institute of Intelligent Systems
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    • v.14 no.6
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    • pp.667-673
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    • 2004
  • The XML is emerging as standard language for data exchange on the Web. Therefore the demand of XML Schema(W3C XML Schema Spec.) that verifies XML document becomes increasing. However, XML Schema has a weak point for design because of its complication despite of various data and abundant expressiveness. This paper shows a simple way of design for XML Schema using a fundamental means for database design, the Entity-Relationship model. The conversion 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 automatic generation is to preserve XML Schema's characteristics such as reusability, global and local ability, ability of expansion and various type changes.

Technique for extracting reusable XML Schema from schema-less XML Documents (스키마가 없는 XML 문서에서의 재사용 가능한 XML Schema 추출 기법)

  • Cho, Jung-Gil;Koo, Yeon-Seol
    • The KIPS Transactions:PartD
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    • v.10D no.4
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    • pp.603-612
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    • 2003
  • According to development of Web, an amount of XML documents has been increasing. So, many researches are proceeding to verify XML data coming from clients and to store or query efficiently database. In order to verify, store and query, DTD or XML Schema of XML documents is necessary. However, Schemaless XML documents couldn't be operated since they do not have either DTD or in Schema. In this paper, we extract XML schema in order to verify XML data and store or query efficiently database from either well-formed XML or XML Schemaless documents. XML Schema extracting technique which is proposed in this paper extract Schema graph using simulation and dataguide that is a extracting technique for semistructured characteristics of XML data. Also, we propose extracting technique for XML Schema using pattern tables that are considerated with Schema graph and reusability.

XML Schema Evolution Approach Assuring the Automatic Propagation to XML Documents (XML 문서에 자동 전파하는 XML 스키마 변경 접근법)

  • Ra, Young-Gook
    • The KIPS Transactions:PartD
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    • v.13D no.5
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    • pp.641-650
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    • 2006
  • XML has the characteristics of self-describing and uses DTD or XML schema in order to constraint its structure. Even though the XML schema is only at the stage of recommendation yet, it will be prevalently used because DTD is not itself XML and has the limitation on the expression power. The structure defined by the XML schema as well as the data of the XML documents can vary due to complex reasons. Those reasons are errors in the XML schema design, new requirements due to new applications, etc. Thus, we propose XML schema evolution operators that are extracted from the analysis of the XML schema updates. These schema evolution operators enable the XML schema updates that would have been impossible without supporting tools if there are a large number of XML documents complying the U schema. In addition, these operators includes the function of automatically finding the update place in the XML documents which are registered to the XSE system, and maintaining the XML documents valid to the XML schema rather than merely well-formed. This paper is the first attempt to update XML schemas of the XML documents and provides the comprehensive set of schema updating operations. Our work is necessary for the XML application development and maintenance in that it helps to update the structure of the XML documents as well as the data in the easy and precise manner.

An Automatic Relational Schema Generating System for an XML Schema (XML Schema에 대한 관계형 스키마 자동 생성 시스템)

  • 김정섭;박창원;정진완
    • Journal of KIISE:Databases
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    • v.31 no.5
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    • pp.527-539
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    • 2004
  • As more and more documents are published in XML, generating relational schemas to store XML documents in a relational database is also getting important. This paper describes a technique as well as its implementation to produce a relational schema from the XML Schema, a standard recently recommended by W3C. The DTD-based inlining technique cannot be applied to the XML Schema, because the XML Schema has many new features, which don't exist in the DTD. Various built-in data types, inheritance, and polymorphism, for example, strengthen the XML Schema, but make the generation of a relational schema from an XML Schema more difficult. We propose an XML Schema Inlining Technique, based on the previous work. The technique first maps various data types in the XML Schema to those of the relational database. After that, it construct the schema graph and the type graph from types and elements defined in the XML Schema. The relational schema is generated while traversing the type graphs. Besides, we describe techniques for handling xsi:type, used for the polymorphism, and the anon#moos type. We also propose a couple of heuristic methods for enhancing the performance of the system. Finally, we conducted experiments to show that our technique is better than the binary table approach.

An Efficient Updating Method conforming to XML Schema for XML data (XML Schema에 대한 유효성을 보장하는 효율적인 XML Data 갱신 기법)

  • 이지현;정진완
    • Proceedings of the Korean Information Science Society Conference
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    • pp.43-45
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    • 2004
  • XML은 인터넷 상에서의 표준 데이터 형식으로 XML 데이터에 대한 구조적 제약 조건들은 DTD나 XML Schema에 정의한다. XML Schema에 유효한 XML 문서는 XML Schema에 정의된 모든 구조적 제약 조건들을 만족해야 하며, 갱신이 발생한 후에도 대응되는 XML Schema에 대해 유효함이 보장되어야 한다. 본 연구는 DBMS에 저장되어 있는 XML Schema에 대해 유효한 XML 데이터를 갱신 할 때 필요한 효율적인 유효 검증 기법을 제안한다. 이 유효 검증 기법에서는 유효 검증 범위를 갱신과 관련된 영역에 한정시키고 갱신 이전에 유효 검증을 수행하여 유효 여부를 판단한다. 또한 본 연구에서는 유효 검증을 위한 유효 검증 제약 조건들과 XML Schema문서의 특성을 분석하여 유효 검증 시 필요한 스키마 정보만을 효율적으로 추출할 수 있는 XML Schema 저장 방법 및 그에 따른 스키마 정보 추출 방법을 제안하고 실험을 통해 그 성능을 보인다.

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XML Schema Document Editing System (XML 스키마 문서편집 시스템)

  • 차원준;최일선;김창수;정회경
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.285-288
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    • 2003
  • Electronic commerce that is constructed in existing and XML document that is used in e-Business field made out because based to DTD. However, XML applications that XML Schema is much after become Recommendation in W3C May, 2001 XML Schema real condition that is developed to base be. Selected XML Schema in ebXML Registry 2.0 by representative thing connected with this. If develop XML Schema, compare when develop using existent DTD and complexity by namespace or object-oriented concept etc. was increasing, and could programming by various method. XML Schema document that is used by ebXML Framework in treatise that see hereupon study about XML Schema document editing system that offer mastication and user interface that can edit efficiently do.

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Update Facility for XML Schema (XML 스키마를 위한 갱신 기능)

  • Lee, Ki-Jun;Hwang, Soo-Chan
    • Journal of KIISE:Computing Practices and Letters
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    • v.16 no.3
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    • pp.324-330
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    • 2010
  • XML schema is widely used as an effective tool for organizing and validating XML data. Although W3C released XQuery and XQuery Update Facility as the standard methods for searching and updating XML data, there is no consideration about providing facilities for updating XML schema itself until now. So users can only update an XML schema file directly by using editors. However, the direct update has several problems: It cannot prevent user's illegal update; it is hard to apply to the XML schemas stored in databases, needs much time to analyze schema, and is likely to make syntactic errors. In this paper, we propose an XML schema update facility, which enables creation, deletion and modification of XML schema by using commands.

An Efficient Transformation Technique from Relational Schema to Redundancy Free XML Schema (관계형 스키마로부터 중복성이 없는 XML 스키마로의 효율적인 변환 기법)

  • Cho, Jung-Gil
    • 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.