
What is an XML model?
About XML
Why use XML? The eXtensible Markup Language is used for different reasons:
♦It describes and structures data, whereas HTML only displays data
♦It uses a
♦It can be exchanged between incompatible systems, since data is stored in plain text format
DTD, XSD or XDR The structure of an XML model is described by a DTD, an XSD or an XDR file:
♦A DTD file is a basic way to describe the structure of an XML document. It is a raw list of all the legal elements making up an XML document
Extract of a DTD file:
♦An XSD file (or schema) is an elaborated way to describe the structure of an XML document. It can support namespaces, derivations, keys, simple and complex
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