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## What is XML Schema? The purpose of XML Schema is to define the legal building blocks of an XML document, similar to DTD. ### XML Schema: * Defines which elements can appear in the document * Defines which attributes can appear in the document * Defines which elements are child elements * Defines the order of child elements * Defines the number of child elements * Defines whether an element is empty or can contain text * Defines data types for elements and attributes * Defines default and fixed values for elements and attributes * * * ## XML Schema is the successor to DTD We believe that XML Schema will soon replace DTD in most web applications. ### The reasons are as follows: * XML Schema can be extended for future needs * XML Schema is more comprehensive and powerful * XML Schema is written in XML * XML Schema supports data types * XML Schema supports namespaces * * * ## XML Schema is a W3C Standard XML Schema became a W3C standard on May 2, 2001. You can find more information about the XML Schema standard in our "(#)."