Sunil Patil introduces the more advanced content repository features that have been standardized by JSR-170, such as versioning and observability.

Relational and object databases lack many data management features required by modern applications, such as versioning, rich data references, inheritence, or fine-grained security. Content repositories extend databases with such additional capabili (...)

With the growing popularity of content management applications, the need for a common, standardized API for content repositories has become apparent. The Content Repository for Java Technology API (JSR-170) aims to provide such an interface. In this (...)

Per ajax, esempi: http://code.google.com/webtoolkit/documentation/examples/