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 They have been superseded by the book An Introduction to XML and Web Technologies Addison-Wesley, and the accompanying online material.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

Schema inclusion and redefinition

• <include schemaLocation="..."/> - compose with schema having same target namespace

• <import namespace="..." schemaLocation="..."/> - compose with schema having different target namespace

• <redefine schemaLocation="..."> ... </redefine> - compose with schema having same target namespace, allowing redefinitions

Example:

<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:b="http://businesscard.org" targetNamespace="http://businesscard.org"> <import namespace="http://www.w3.org/1999/xhtml" schemaLocation="xhtml.xsd"/> <redefine schemaLocation="phone.xsd"> <element name="phone"> ... </element> </redefine> ... </schema>

Here, a schema for XHTML is imported together with phone.xsd (which is assumed to contain a description of phone numbers) and its description of phone is redefined.

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