The full name of DTD is Document Type Definition.
What is a DTD?
A DTD is a set of rules that defines the structure and content of an XML document. It specifies:
- Elements: The names of the elements that can appear in the document.
- Attributes: The attributes that can be associated with elements.
- Data types: The types of data that can be stored in elements and attributes.
- Relationships: The relationships between elements and attributes.
Purpose of DTDs
DTDs are used to:
- Validate XML documents: Ensure that XML documents conform to the specified structure and content rules.
- Document structure: Provide a clear and consistent structure for XML documents.
- Data exchange: Facilitate data exchange between different systems by defining a common data format.
Examples of DTDs
- HTML DTD: Defines the structure and content of HTML documents.
- MathML DTD: Defines the structure and content of mathematical formulas in XML.
- SVG DTD: Defines the structure and content of scalable vector graphics in XML.
