1. Jennifer Widom XML Data XML Schema

2. Jennifer Widom XML Schema “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

3. Jennifer Widom XML Schema (XSD)  Extensive language  Like DTDs, can specify elements, attributes, nesting, ordering, #occurrences  Also data types, keys, (typed) pointers, and more  XSD is written in XML This video: One “easy” example, language is vast XML Schema