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Difference between XML Schema and DTD

Difference between XML Schema and DTD

There are a lot of talks these days about XML Schema and DTD. Many people are wondering what the difference between them is, and which one they should be using. In this blog post, we will explore the differences between XML Schema and DTD, and help you decide which one is right for you.

What is XML Schema?

XML Schema is a language for XML documents that describes the structure and content of those documents. XML Schema is also used to validate XML documents, ensuring that they are well-formed and meet the requirements specified in the schema. XML Schema is an important tool for XML developers, as it allows them to specify precisely what kind of XML document they are dealing with. This makes it easier to process and manipulate XML documents, as well as provides a way to ensure that those documents conform to a particular standard. XML Schema is a vital part of the XML development ecosystem, and its importance is only likely to grow in the future.

What is DTD?

  • A DTD is a Document Type Definition. It is a markup language that defines the structure and elements of a document. A well-formed document must conform to the rules specified in the DTD.
  • DTDs are usually written in XML, although they can be written in any language. XML is used because it is easy to read and understand, and it is easy to write DTDs in XML.
  • DTDs can be very simple, or very complex. The complexity of a DTD depends on the complexity of the document it is meant to define.
  • A DTD can be included in a document, or it can be stored in a separate file. If it is stored in a separate file, it is called an external DTD.
  • DTDs are not mandatory, but they are recommended. Including a DTD in a document helps to ensure that the document is well-formed and valid.

Difference between XML Schema and DTD

  • XML Schema and DTD are two types of markups used in XML (Extensible Markup Language). XML is a text file format that is used to store data. XML Schemas are like templates that are used to validate the structure of an XML document, while DTDs (Document Type Definitions) are used to define the meaning of the tags in an XML document.
  • XML Schemas are written in the XML language, which makes them more flexible and easier to read and understand than DTDs. In addition, XML Schemas can be used to specify data types, whereas DTDs can only specify element and attribute names.
  • Finally, XML Schemas can be imported and reused, while DTDs cannot. For these reasons, XML Schema is generally preferred over DTD.


In this article, we’ve explored the differences between XML Schema and DTD. We’ve looked at how they both work and what benefits each has to offer users. Hopefully, by now you have a good understanding of which option is best for your specific needs.

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