XQuery

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• Versions Covered
• XQuery
• XQuery Language
• Documents to Query
• Physical Representations to Query
• Where is XQuery used?
• The XML Model vs. the Relational Model
• Query Data Types
• An example document to query
• The XQuery FLWOR
• Query: List titles of all books
• Query Result: Book Titles
• XQueryX
• Specifying a context node
• Query Result with wrapping
• XPath 1.0 Data Model
• XPath 2.0 Data Model
• Constructing sequences
• Sequence example
• Data types and the PSVI
• Questions?
• Element Constructors
• Query Result: Book Titles
• Attribute Constructors
• Query Result
• Text Constructors
• Query Result
• Other Constructors
• Expected Query Result
• Query with where
• Query Result: Titles of books published by Addison-Wesley
• Query with Booleans
• Query Result: books published by Addison-Wesley before 1993
• Query with multiple variables
• Query Result: A list of all the title-author pairs
• Nested FLWOR Queries
• Query Result: A list of the title and authors of each book in the bibliography
• Query with let
• Query Result: price differences
• if then else
• Query Result: Price differences
• Query with sorting
• Query Result
• A different document about books
• This document uses a different DTD
• Query that joins two documents
• Result
• prices.xml Query Sample Data
• Query with reused variables
• Query Result
• Multiple FLWOR Queries
• Query Result
• Querying documents that use namespaces
• Questions?
• Query Software
• What's the difference between XQuery and XSLT?
• XPath 2.0
• XPath 2.0 Goals
• Held over from XPath 1.0
• Accessor Functions
• Constructor Functions
• Casting
• Four kinds of comparison operators
• Value comparison operators
• General comparisons
• Node comparisons
• Order comparisons
• Questions?
• Functions and operators
• Arithmetic operators
• Numeric Functions
• String functions
• Regular expressions
• Boolean Functions and Operators
• Date and time functions
• Qualified Name Functions
• Node Functions
• Sequence Functions
• Sequence size Functions
• Context Functions
• Questions?
• Other New features in XPath 2.0
• XPath Comments
• Namespace wildcards
• Can use functions as location steps
• Can use parenthesized expressions as location steps
• Dereference steps
• For Expressions
• for Example
• for Example
• Conditional Expressions
• Quantified Expressions
• Questions?
• To Learn More
• Questions?

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