 XML DTD and XML Schema Discussion Sessions 1A and 1B Session 2.

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Presentation transcript:

 XML DTD and XML Schema Discussion Sessions 1A and 1B Session 2

XML eXtensible Markup Language Colossus of Rhodes Greece 107 Great Pyramid of Giza Egypt 147

DTD Document Type Definition Meaning of *, +, and ? #PCDATA and CDATA Order of elements and attributes #REQUIRED and #IMPLIED

DTD Document Type Definition  What about an empty element?  Can we define an unsorted list of elements?  An element with anything?  Attributes with choices?  Why to use attribute IDs?  IDREF(S)?

DTD Document Type Definition  Pros  Compact structure  Can be defined inline  Wide support among parsers  Cons  Are not written in XML  Don’t support Namespaces  Don’t have data – typing  Have limited capacity for counters

XML Schema Types of elements Simple type Complex type

XML Schema Simple Type Egypt Different ways to define this element: <xs:element name=”location" type="xs:string" /> <xs:element name="location" type="stringType" />...

XML Schema Complex Type Complex type Text + Attributes Elements + Attributes Attributes only Text + Elements + Attributes

XML Schema Complex Type: Simple Content 100 Just to generate this simple line!

XML Schema Complex Type: Complex Content 1 <xs:element name="wonder" type="wonderType" minOccurs="2" maxOccurs="unbounded"/> What does this segment of code do?

XML Schema Complex Type: Complex Content 2 <xs:attribute name="source" default="ancient.jpg" type="xs:string"/> An empty element that contains only attributes

XML Schema Complex Type: Complex Content 3 A mixed element that combines children elements, text, and attributes