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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 DTDs, IDs & IDREFs “Valid” XML Adheres to basic structural requirements Also adheres to content-specific specification • Document Type Descriptor (DTD) • XML Schema (XSD) Jennifer Widom DTDs, IDs & IDREFs “Valid” XML Adheres to basic structural requirements Also adheres to content-specific specification XML XML Parsed XML Document Parser “Not well-formed” Jennifer Widom DTDs, IDs & IDREFs “Valid” XML Adheres to basic structural requirements Also adheres to content-specific specification DTD or XSD Validating XML XML Document Parser “Not well-formed” Jennifer Widom DTDs, IDs & IDREFs “Valid” XML Adheres to basic structural requirements Also adheres to content-specific specification DTD or XSD Validating XML Parsed XML XML Document Parser “Not valid” Jennifer Widom 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) Jennifer Widom DTDs, IDs & IDREFs DTD/XSD versus none (well-formed) + DTD/XSD - DTD/XSD Jennifer Widom

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Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.