a means of associating one or more elements in an XML document with a particular URI. This effectively means that the element is identified by both its name and its namespace URI. See http://www.w3.org/TR/REC-xml-names
A way of defining each element type and attribute name in an XML document unambiguously (through associations with specific URIs) so that two or more XML-based languages may be used in that document without creating a conflict.
a collection of element and attribute names, identified by a Unique Resource Identifier (URI), which often takes the form of a URL, but is really just a unique string, not a pointer to a web page
a collection of element type and attribute names
a collection of the XML vocabulary unique to an organization
a means of qualifying elements and attribute names to disambiguate from other names in the same document
a mechanism for qualifying names
a namespace for a particular XSD
a way of mapping specific element or attribute references within a document to collections of elements and attributes through the use of prefixes on the element or attribute names
a way of saying whose dictionary you are using for a given element, allowing us to mix them freely
An XML namespace provides a simple method for qualifying element and attribute names used in XML documents by associating them with namespaces identified by a URI reference. The XML Namespace specification is currently a recommendation with the W3C.
An XML specification for qualifying the tag names used in XML documents by associating them with their source.
a means of grouping XML elements and attributes, allowing each application to define the names without concerns of conflict with names used by other applications. A namespace is defined by a URI that will uniquely identify the namespace. The URI need not be an actual internet URL, but often is. Namespaces are identified in code by a prefix.
An XML namespace is a collection of names, identified by a URI reference [RFC2396], which are used in XML documents as element types and attribute names. XML namespaces differ from the "namespaces" conventionally used in computing disciplines in that the XML version has internal structure and is not, mathematically speaking, a set. Source: quoted from W3C—Namespaces in XML at http://www.w3.org/TR/REC-xml-names
An XML Namespace is a W3 C standard for providing uniquely named elements and attributes in an XML instance. An XML instance may contain element or attribute names from more than one XML vocabulary. If each vocabulary is given a namespace then the ambiguity between identically named elements or attributes can be resolved.