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What is Document Type Definition (DTD)

Chapter 71
Encyclopedia of Internet Technologies and Applications
A DTD is a metadocument containing information about how a given set of SGML tags can be used. In the XML world this role will be taken over by a schema.
Published in Chapter:
The Semantic Web
Kevin Curran (University of Ulster, Ireland) and Gary Gumbleton (University of Ulster, Ireland)
Copyright: © 2008 |Pages: 7
DOI: 10.4018/978-1-59140-993-9.ch071
Abstract
Tim Berners-Lee, director of the World Wide Web Consortium (W3C), states that, “The Semantic Web is not a separate Web but an extension of the current one, in which information is given well-defined meaning, better enabling computers and people to work in cooperation” (Berners-Lee, 2001). The Semantic Web will bring structure to the meaningful content of Web pages, creating an environment where software agents, roaming from page to page, can readily carry out sophisticated tasks for users. The Semantic Web (SW) is a vision of the Web where information is more efficiently linked up in such a way that machines can more easily process it. It is generating interest not just because Tim Berners-Lee is advocating it, but because it aims to solve the problem of information being hidden away in HTML documents, which are easy for humans to get information out of but are difficult for machines to do so. We will discuss the Semantic Web here.
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Chapter 10
A Web-Based Application to Exchange Electronic Health Records and Medical Images in Ophthalmology
DTD is primarily used for the expression of a schema via a set of declarations that conform to a particular markup syntax and that describe a class, or type, of SGML or XML documents, in terms of constraints on the structure of those documents. A DTD may also declare constructs that are not always required to establish document structure, but that may affect the interpretation of some documents.
Published in Chapter: A Web-Based Application to Exchange Electronic Health Records and Medical Images in Ophthalmology; From: Handbook of Research on Distributed Medical Informatics and E-Health
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Chapter 11
Integrating Heterogeneous Data for Big Data Analysis
A document that defines the structure of an XML document with a listing of its permissible elements and attributes. A group of elements may be nested within another in a DTD. For example, the elements of FirstName and LastName may be enclosed within another element: PersonRecord. The elements may have attributes that indicate whether the element is required to be present in the document or if it is implicit.
Published in Chapter: Integrating Heterogeneous Data for Big Data Analysis; From: Handbook of Research on Cloud Infrastructures for Big Data Analytics
Full Text Chapter Download: US $37.50 Add to Cart
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