Jennifer Widom XML Data DTDs, IDs & IDREFs. Jennifer Widom DTDs, IDs & IDREFs “Well-Formed” XML Adheres to basic structural requirements Single root element.

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Presentation transcript:

Jennifer Widom XML Data DTDs, IDs & IDREFs

Jennifer Widom DTDs, IDs & IDREFs “Well-Formed” XML Adheres to basic structural requirements Single root element Matched tags, proper nesting Unique attributes within elements

Jennifer Widom “Valid” XML Adheres to basic structural requirements  Also adheres to content-specific specification Document Type Descriptor (DTD) XML Schema (XSD) DTDs, IDs & IDREFs

Jennifer Widom “Valid” XML Adheres to basic structural requirements  Also adheres to content-specific specification XML Parser XML Parser XML Document XML Document Parsed XML “Not well-formed” DTDs, IDs & IDREFs

Jennifer Widom “Valid” XML Adheres to basic structural requirements  Also adheres to content-specific specification Validating XML Parser Validating XML Parser XML Document XML Document “Not well-formed” DTD or XSD DTDs, IDs & IDREFs

Jennifer Widom “Valid” XML Adheres to basic structural requirements  Also adheres to content-specific specification Validating XML Parser Validating XML Parser XML Document XML Document Parsed XML “Not valid” DTD or XSD DTDs, IDs & IDREFs

Jennifer Widom Document Type Descriptor (DTD)  Grammar-like language for specifying elements, attributes, nesting, ordering, #occurrences  Also special attribute types ID and IDREF(S) DTDs, IDs & IDREFs

Jennifer Widom DTD/XSD versus none (well-formed) + DTD/XSD - DTD/XSD DTDs, IDs & IDREFs