• 1. Data Storage and Structure
  • 1.1. Data Storage
  • 1.2. XML Introduction
  • 1.3. XML Syntax
  • 1.4. XML DTD / Schema
    • 1.4.1. XML DTD
    • 1.4.2. XML Schema
    • 1.4.3. "Valid" XML documents
    • 1.4.4. DTD versus XML Schema
    • 1.4.5. Unit-Summary
  • 1.5. Self Assessment
  • 1.6. Summary
  • 1.7. Glossary
  • 1.8. Bibliography
  • 1.9. Metadata

1.4.5. Unit-Summary

DTD

A Document Type Definition defines the legal building blocks of an XML document with a list of legal elements. A DOCTYPE declaration can be internal or external.

XML Schema

An XML Schema defines the legal building blocks of an XML document, just like a DTD. The possibilities of XML Schemas are richer than the ones of DTDs.

XML Schema versus DTD

In the future, XML Schema might be used as a replacement for DTD's because XML Schemas...:

• ...are extensible to future additions,
• ...are richer and more useful than DTDs,
• ...are written in XML,
• ...support simple (integer, decimal, string, boolean, dateTime, etc.) and complex data types,
• ...support namespaces.

Because XML Schemas are written in XML, they possess the same advantages as XML documents.

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Update: 26.1.2012 (eLML) - Contact - Print (PDF) - © CartouCHe 2004-2007 (Creative Commons) - layout based on YAML