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Libraries play a critical role in the dissemination of Knowledge and serve as repositories of knowledge. Internet has been instrumental in delivering digital information worldwide. With the advent of semantic web, there has been a paradigm shift from digital libraries (DL) to semantic digital libraries (SemDL) to address the issues and challenges of DL. Semantic Web aims at transforming the current web, dominated by unstructured and semi-structured documents into a "web of data". SemDL is an initiative that allows the system to assist end users in retrieval of the most relevant content with respect to a description of their information needs. Semantic techniques have been considered from the perspective of DL and how it enhances the functioning of DLs. The key players of the semantic techniques in the context of DL are XML, XML Schema, RDF, RDF Schema, Web Ontology Language (OWL). Jerome DL is one such success story that shows the potentials of the semantic techniques to sort the problems/challenges of DL and how it improves browsing and searching of resources. The future tends to focus more keenly on the sharing of user knowledge and not merely Information Retrieval. One of the obvious outcomes is the advent of Social Semantic Digital Library (SSDL) to improve user benefits by empowering user interfaces and social networking.