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In the context of the emergent Web of Data, a large number of organizations,institutes and companies (e.g., DBpedia, Geonames, PubMed ACM, IEEE, NASA, BBC)adopt the Linked Data practices and publish their data utilizing Semantic Web(SW) technologies. On the other hand, the dominant standard for informationexchange in the Web today is XML. Many international standards (e.g., DublinCore, MPEG-7, METS, TEI, IEEE LOM) have been expressed in XML Schema resultingto a large number of XML datasets. The SW and XML worlds and their developedinfrastructures are based on different data models, semantics and querylanguages. Thus, it is crucial to provide interoperability and integrationmechanisms to bridge the gap between the SW and XML worlds. In this chapter, wegive an overview and a comparison of the technologies and the standards adoptedby the XML and SW worlds. In addition, we outline the latest efforts from theW3C groups, including the latest working drafts and recommendations (e.g., OWL2, SPARQL 1.1, XML Schema 1.1). Moreover, we present a survey of the researchapproaches which aim to provide interoperability and integration between theXML and SW worlds. Finally, we present the SPARQL2XQuery and XS2OWL Frameworks,which bridge the gap and create an interoperable environment between the twoworlds. These Frameworks provide mechanisms for: (a) Query translation (SPARQLto XQuery translation); (b) Mapping specification and generation (Ontology toXML Schema mapping); and (c) Schema transformation (XML Schema to OWLtransformation).

The XML and Semantic Web Worlds: Technologies, Interoperability and Integration. A Survey of the State of the Art