"A collection of element and attribute names designed to reduce confusion and ambiguity when dealing with XML documents. Generally available for consultation from a commonly available Internet address." (Robert D. Schneider and Darril Gibson, "Microsoft SQL Server 2008 All-In-One Desk Reference For Dummies", 2008)
"The set of unique names used to identify objects within a well-defined domain, particularly relevant for XML applications. An XML Namespace is a W3C recommendation for providing uniquely named elements and attributes in an XML instance. A namespace is declared using the reserved XML attribute xmlns, the value of which must be a URI (Uniform Resource Identifier) reference." (J P Getty Trust, "Introduction to Metadata" 2nd Ed., 2008)
"A defined domain within which a name is guaranteed to be unique and findable. A reusable reference glossary of XML attributes found at a URL address. Entity and attribute names used in XML documents can be easily qualified by associating them with namespaces identified by URL references." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"A namespace is the metadata realm in which a metadata tag applies. The purpose of a namespace is to distinguish metadata tags that have the same name, but a different meaning." (Jules H Berman, "Principles of Big Data: Preparing, Sharing, and Analyzing Complex Information", 2013)
"In XML and XQuery, a uniform resource identifier (URI) that provides a unique name to associate with the element, attribute, and type definitions in an XML schema or with the names of elements, attributes, types, functions, and errors in XQuery expressions." (Sybase, "Open Server Server-Library/C Reference Manual", 2019)
"A unique identifier that indicates the names of particular data elements or attributes used within an XML file." (Microfocus)
"A collection of names that is used to identify elements, types, and attributes in XML documents identified in a URI reference" (RFC 3986)
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