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Thus, having a sound grasp of the namespace concept is essential for understanding XML Schema and instance validation overall.
Second and most important, because it might have a severe impact on the syntax, or to be specific, on the production rules of XMLthe reason being that an IRI might have characters that are not allowed in XML tags per the It would be painful to repeatedly qualify an element or attribute you wish to use from a namespace. Remember, at any point in time, there can be only one in existence.
Therefore, the term "Default Namespaces" is inherently incorrect.
Rather, the namespace is intended to serve as a virtual "container" for vocabulary and un-displayed content that can be shared in the Internet space.
In the Internet space URLs are uniquehence you would usually choose to use URLs to uniquely identify namespaces.