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XML Data

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

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XML Data

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  1. XML Data DTDs, IDs & IDREFs

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

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

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

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

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

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

  8. DTDs, IDs & IDREFs DTD/XSD versus none (well-formed)

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