2 Introduction

The JCR specification defines an abstract model and a Java API for data storage and related services commonly used by content-oriented applications. The target domain encompasses not only traditional content management systems but, more broadly, any application that must handle both unstructured digital assets and structured or semi-structured information.

The repository model enables efficient access to both large binary objects and finely-structured hierarchical data through a simple, generic API and a robust and extensible object typing system. Additionally, many features that are traditionally custom-built on top of RDBMSs and file systems have been incorporated into the repository itself. These include support for query, access control, versioning, locking and observation. Standardized support for these services further enables applications that might not normally have access to such advanced features to take advantage of them, since they are built-in at the infrastructure level.