Document type definition (DTD)
A document type definition (DTD) is a set of rules that defines the structure and content of an XML (Extensible Markup Language) document. It specifies the elements, attributes, and entities that are allowed in the document and the relationships between them. DTDs are used to ensure that XML documents conform to a specific format and can be validated against the DTD to ensure their accuracy and consistency.
Example use cases
- Validating XML documents: DTDs can be used to ensure that XML documents conform to a specific structure and set of rules
- Defining data exchange formats: DTDs can be used to specify the format and structure of data that is exchanged between different systems or organizations
- Defining content for webpages: DTDs can be used to specify the structure and content of webpages, ensuring that they meet certain standards and can be viewed correctly in different browsers
- Creating and validating electronic forms: DTDs can be used to specify the structure and content of electronic forms, ensuring that they collect the necessary information, and that the data is accurate and consistent
- Defining metadata for digital assets: DTDs can be used to specify the metadata (i.e. descriptive information) for digital assets such as images, videos, and audio files, making it easier to search and manage these assets.