Final answer:
XML Schema and XML DTD differ in data type support, validation features, namespace support, and syntax. XML Schema offers more advanced features and is written in XML syntax, while DTD is more limited and uses a distinct syntax.
Step-by-step explanation:
Difference between XML Schema and XML DTD
The difference between an XML Schema and an XML DTD (Document Type Definition) is primarily in terms of expressiveness, precision, and namespace support.
DTD:
- Lacks support for modern data types.
- Cannot specify number ranges or patterns for data validation.
- Does not support XML Namespaces, affecting the reusability of XML documents across different domains.
- DTDs are written in a syntax that is distinct from XML, making it less consistent with XML-based tools.
XML Schema:
- Supports a wide variety of data types, similar to database types.
- Allows the definition of custom data types and can specify patterns and ranges for validation.
- Has strong namespace support, facilitating the mixing of different XML vocabularies.
- Written in XML-syntax, providing a more consistent experience with XML parsers and tools.