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XML documents often refer to other documents that an XML processor has to retrieve in order to make sense of the main document. These external resources, typically referred to by URIs, may be local files; or they may be remote, distributed across the web. In an ideal world the difference would be invisible, since it would be as cheap to access a remote resource as a local one. However, in the real world network failures do occur, and it is wise to design applications tha 
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