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What is an XML model?
4 PowerDesigner
About XML
The eXtensible Markup Language is used for different reasons:
♦ It describes and structures data, whereas HTML only displays data
♦ It uses a self-describing and personalized syntax
♦ It can be exchanged between incompatible systems, since data is stored
in plain text format
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 user-defined data types and a robust collection of
predefined data types
Why use XML?
DTD, XSD or XDR