Each individual example in this directory is described in the QTI v2.2 Implementation Guide in terms of the main features it demonstrates.

For those eager to jump right into the examples first:
The file: "packages/ccQTIpackage.zip" represents a simple but complete package that illustrates all item, test, metadata and packaging aspects of the specification with the most common interaction types and is the recommended starting point. 

2017-10-06: This update changes the old schema location: http://www.imsglobal.org/xsd/qti/qtiv2p2/imsqti_v2p2.xsd
to the latest version: http://www.imsglobal.org/xsd/qti/qtiv2p2/imsqti_v2p2p2.xsd
The namespace remains unchanged: http://www.imsglobal.org/xsd/imsqti_v2p2