write difference between document type declaration and document type d

1.	write difference between document type declaration and document type definition
Answer» \tS.NO.DTDXSD1.DTD are the declarations that define a document type for SGML.XSD describes the elements in a XML document.2.It doesn’t support namespace.It supports namespace.3.It is comparatively harder than XSD.It is relatively more simpler than DTD.4.It doesn’t support datatypes.It supports datatypes.5.SGML syntax is used for DTD.XML is used for writing XSD.6.It is not extensible in nature.It is extensible in nature.7.It doesn’t give us much control on structure of XML document.It gives us more control on structure of XML document.\t

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