MDA - markup/xml/validation/xml-schema

disadvantage: is notated in XML -- extremely verbose
advantage: support name spaces
disadvantage: big standard only for big players -> software offering limited
Comment:: simple to complex data types -- more data oriented -- explicit type hierarchy
quote: "XML Schema is in the XML world what ASN.1 was in the OSI universe."
advantage: reuse/embedding of schemas formalized -- one document can reference multiple schemas
Comment:: defines what elements and attributes can appear where in an XML document -- order, occurrences -- russian doll syndrom
Comment:: definition language for structural data/documents -- XML based alternative to DTD
advantage: is notated in XML -- can process it as XML document
Comment:: data patters -- useful for defining formats
disadvantage: no real formal model behind it?
Comment:: data facetting -- subclassing with restriction and extension

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