RESTful atomic services for distributed digital libraries

In this paper we describe atomic services for distributed digital libraries based on RESTful web services. Our understanding of atomic services (as the basic building blocks for distributed digital libraries) was described in one of our previous works. Those services are: content storage service, metadata storage service, composition and relation service, and search service. Communication protocols and a mechanism for discovery and composition of such services was developed. RESTful atomic services for digital libraries can be used to provide the functionality of a digital library on different layers of distributed systems: from Web 2.0 AJAX interfaces to the lowest middleware components.