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Why XML (eXtensible Markup Language)

Why XML (eXtensible Markup Language). To allow the definition and use of many application-specific markup languages Slogan: XML does for data what Java does for programs: platform-independent and vendor-independent format www.w3.org/TR. Why markup languages?.

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Why XML (eXtensible Markup Language)

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  1. Why XML (eXtensible Markup Language) • To allow the definition and use of many application-specific markup languages • Slogan: XML does for data what Java does for programs: platform-independent and vendor-independent format • www.w3.org/TR

  2. Why markup languages? • Contain plenty of concrete syntax. Easy to parse and human readable. • Address = “<address>” … “</address>”. • Graph = “<graph>” … “</graph>”.

  3. Connections • Languages • grammar for grammars • grammar for language • sentence of language • Markup Languages • XML: grammar for grammars of markup langs • grammar for specialized markup language • document

  4. Applications of XML • MathML • XMI? Define interchange format for UML objects • Textual description of objects • Textual description of multimedia: SMIL Synchronized Multimedia Integration Language

  5. Simplified example using proposed XML/Document Content Description(Microsoft/IBM) <DCD> <ElementDef Type=“Booking”> <Description> Airline res. </Description> <Group Order=“Seq”> <Element> LastName</Element> <Element> FirstInitial </Element> … <Element> SeatRow </Element> </Group> </ElementDef>

  6. Simplified example using proposed XML/Document Content Description(Microsoft/IBM) <ElementDef Type=“SeatRow” Model=“Data” DataType=“int” Min=“1” Max=“72” /> </DCD> ============== Example Booking object: <Booking> <LastName> Finkelstein </LastName> <FirstInitial> L </FirstInitial> <SeatRow> 33 </SeatRow> … </Booking>

  7. Very Simplified XML CanonicalXML = List(Pi) Element List(Pi). Element = Stag Inner Etag. Inner : DataChar | Pi | Element. Stag = “<“ Name Atts “>”. Etag = “</” Name “>”. Pi = “<?” ... “?>”. Atts = List(Att). Att = Name = “””” … “”””. List(S) ~ {S}.

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