NOTE: These slides have not been updated since 2003. They have been superseded by the book An Introduction to XML and Web Technologies Addison-Wesley, and the accompanying online material. Please see http://www.brics.dk/ixwt/ for more information. Anders Møller and Michael Schwartzbach, February 2006

THE XML REVOLUTION  -  TECHNOLOGIES FOR THE FUTURE WEB

Datatype expressions

Constant values can be written:

• as literals (like string, integer, float)
• as constructor functions (true(), date("2001-06-07"))
• as explicit casts (cast as xsd:positiveInteger(47))

Arbitrary XML Schema documents can be imported into a query.

An instance of operator allows runtime validation of any value relative to a datatype or a schema.

A typeswitch operator allows branching based on types.

COPYRIGHT © 2000-2003 ANDERS MØLLER & MICHAEL I. SCHWARTZBACH