XML namespace
A simple example would be to consider an XML instance that contained references to a customer and an ordered product.In version 1.1 of the recommendation, the namespace name becomes an Internationalized Resource Identifier, which licenses the use of non-ASCII characters that in practice were already accepted by nearly all XML software.The Namespaces specification does not say what should happen if such a URL is dereferenced (that is, if software attempts to retrieve a document from this location).[5] In general, however, users should assume that the namespace URI is simply a name, not the address of a document on the Web.Applications should avoid attaching any significance to the choice of prefix, but the information is provided because it can be helpful to human readers.