DTD tutorial and xsd tutorial(XML Schema Tutorial)

 

The purpose of a DTD (Document Type Definition) is to define the legal building blocks of an XML document.

DTD defines the document structure with a list of legal elements and attributes.

 

http://www.w3schools.com/dtd/default.asp

 

XML Schema is an XML-based alternative to DTDs.

An XML Schema describes the structure of an XML document.

 

http://www.w3schools.com/Schema/default.asp