URIs and XML Namespaces
URI, or uniform resource identifier, is a generic term used to identify some particular entity or object in the Web world using its string representation. This is the most fundamental addressing scheme of the Web. A perfect use for this uniqueness deals with naming XML elements and attributes so that they don't conflict with one another. This section reviews the characteristics of URIs and namespaces, and describes how they are related when used with your XML documents.
URLs and URNs
Different types of Web resources require different forms of URIs. Specifically, uniform resource locators (URLs) and uniform resource names (URNs) are both forms of a URI (see Figure 3.1). Each has its own syntax designed to fulfill a purpose. ...
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