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XML Data DTDs, IDs & IDREFs.

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Presentation on theme: "XML Data DTDs, IDs & IDREFs."— Presentation transcript:

1 XML Data DTDs, IDs & IDREFs

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

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

4 Adheres to basic structural requirements
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 Adheres to basic structural requirements
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 Adheres to basic structural requirements
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 Document Type Descriptor (DTD)
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 DTD/XSD versus none (well-formed)
DTDs, IDs & IDREFs DTD/XSD versus none (well-formed) + DTD/XSD - DTD/XSD

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