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DTD schema: a simple but powerful XML schema language

DTD schema: a simple but powerful XML schema language Purpose – The purpose of this paper is to describe a novel XML schema language called DTD Schema that solves major limitations of document type definition (DTD) and supports features that XML Schema supports in a simple and concise way. Design/methodology/approach – DTD Schema is designed based on DTD and data definition language of object‐oriented and object‐relational databases. It extends DTD with namespaces, richer built‐in types and user‐defined subtypes, local elements and attributes, complex types with nonmonotonic multiple element and attribute inheritance with overriding, blocking, conflict handling, and polymorphism. Findings – XML Schema is recommended by W3C as the schema language for XML. It uses a set of predefined XML tags to define the schema, which is often a long, intricate specification, full of details and concepts and its verbose syntax often doubles or triples the document length. It is so complicated that even XML experts do not find it human‐readable, mostly due to the XML‐based syntax. Research limitations/implications – The only limitation is that DTD Schema is not in XML. But for the same reason, it is simple and concise. Practical implications – DTD schema is halfway between DTD and XML Schema and thus it is less complex and much easier for human to use than XML Schema. Originality/value – DTD Schema supports all functionalities of XML Schema and also the best of object‐oriented features including multiple inheritance, overriding, blocking, conflict handling and polymorphism. Therefore, it is much more expressive than XML Schema. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Web Information Systems Emerald Publishing

DTD schema: a simple but powerful XML schema language

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Publisher
Emerald Publishing
Copyright
Copyright © 2008 Emerald Group Publishing Limited. All rights reserved.
ISSN
1744-0084
DOI
10.1108/17440080810919495
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to describe a novel XML schema language called DTD Schema that solves major limitations of document type definition (DTD) and supports features that XML Schema supports in a simple and concise way. Design/methodology/approach – DTD Schema is designed based on DTD and data definition language of object‐oriented and object‐relational databases. It extends DTD with namespaces, richer built‐in types and user‐defined subtypes, local elements and attributes, complex types with nonmonotonic multiple element and attribute inheritance with overriding, blocking, conflict handling, and polymorphism. Findings – XML Schema is recommended by W3C as the schema language for XML. It uses a set of predefined XML tags to define the schema, which is often a long, intricate specification, full of details and concepts and its verbose syntax often doubles or triples the document length. It is so complicated that even XML experts do not find it human‐readable, mostly due to the XML‐based syntax. Research limitations/implications – The only limitation is that DTD Schema is not in XML. But for the same reason, it is simple and concise. Practical implications – DTD schema is halfway between DTD and XML Schema and thus it is less complex and much easier for human to use than XML Schema. Originality/value – DTD Schema supports all functionalities of XML Schema and also the best of object‐oriented features including multiple inheritance, overriding, blocking, conflict handling and polymorphism. Therefore, it is much more expressive than XML Schema.

Journal

International Journal of Web Information SystemsEmerald Publishing

Published: Nov 21, 2008

Keywords: Extensible markup language; Markup languages; Document management

References