DTD / XSD

DTD는 namespace를 지원하지 않고
XSD는 XML 표준에 namespace를 지원한다.
XSD를 쓰는게 더 나을거 같기도 하고..
[링크 : http://stackoverflow.com/questions/1490583/dtd-or-xml-schema-which-one-is-better]

일단 예제를 보면 DTD는 XML 포맷이 아니고 XSD는 XML 포맷이다.

<!DOCTYPE note [ <!ELEMENT note (to,from,heading,body)> <!ELEMENT to (#PCDATA)> <!ELEMENT from (#PCDATA)> <!ELEMENT heading (#PCDATA)> <!ELEMENT body (#PCDATA)> ]>  [링크 : http://www.w3schools.com/xml/xml_dtd.asp] DTD

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="note">   <xs:complexType>     <xs:sequence>       <xs:element name="to" type="xs:string"/>       <xs:element name="from" type="xs:string"/>       <xs:element name="heading" type="xs:string"/>       <xs:element name="body" type="xs:string"/>     </xs:sequence>   </xs:complexType> </xs:element> </xs:schema>  [링크 : http://www.w3schools.com/schema/] XSD

[링크 : http://bsp.mits.ch/xsd2dtd/] XSD to DTD