DTD - Purpose of DTD

DTD (Document Type Definition) is used to define the structure of an XML document in a clear and systematic way. It acts as a set of rules that an XML document must follow.

The main purpose of DTD is to specify which elements are allowed in an XML document. It also defines how these elements are arranged and nested within each other.

DTD helps maintain consistency in XML documents, especially when the same document format is used by multiple systems or users. This ensures uniform data representation.

Another important role of DTD is validation. It checks whether the XML document is written correctly according to the defined rules.

DTD reduces errors by preventing invalid elements or attributes from being used. This improves the accuracy of data storage and exchange.

It also makes XML documents easier to understand and maintain, as the structure is clearly documented.