Jennifer Widom XML Data Introduction, Well-formed XML.

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Presentation transcript:

Jennifer Widom XML Data Introduction, Well-formed XML

Jennifer Widom Well-Formed XML Extensible Markup Language (XML)  Standard for data representation and exchange  Document format similar to HTML Tags describe content instead of formatting  Also streaming format

Jennifer Widom Well-Formed XML Basic constructs  Tagged elements (nested)  Attributes  Text

Jennifer Widom Well-Formed XML Relational Model versus XML RelationalXML Structure Schema Queries Ordering Implementation

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

Jennifer Widom Well-Formed XML “Well-Formed” XML Adheres to basic structural requirements Single root element Matched tags, proper nesting Unique attributes within elements XML Parser XML Parser XML Document XML Document Parsed XML “Not well-formed”

Jennifer Widom Well-Formed XML Displaying XML Use rule-based language to translate to HTML Cascading stylesheets (CSS) Extensible stylesheet language (XSL)

Jennifer Widom Well-Formed XML Displaying XML Use rule-based language to translate to HTML Cascading stylesheets (CSS) Extensible stylesheet language (XSL) CSS/XSL interpreter CSS/XSL interpreter XML Document (data) XML Document (data) Rules HTML Document (look at) HTML Document (look at)

Jennifer Widom Well-Formed XML Extensible Markup Language (XML)  Standard for data representation and exchange  Formal specification is enormous; we cover most important components