XML namespaces intro

XML:
Simple example without schema involvement
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XML Schema:
targetNamespace

"targetNamespace is used in a schema to specify the namespace that the schema is intended to define" -David Peterson, at JavaRanch

"Each schema document has exactly one target namespace." -XML in a Nutshell

default namespace

noNamespaceSchemaLocation
noNamespaceSchemaLocation: schema to reference for elements that have no namespace prefix?
"The noNamespaceSchemaLocation attribute references an XML Schema document that does not have a target namespace. "

schemaLocation

Interface between XML document and its schema:
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Note from w3schools:

The namespace URI is not used by the parser to look up information.

The purpose is to give the namespace a unique name. However, often companies use the namespace as a pointer to a web page containing namespace information.