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The primary purpose of XML Schemas is to declare vocabularies.
These vocabularies can be identified by a namespace that is specified in the targetNamespace attribute.
Not all XML Schemas will have a targetNamespace.
Many XML Schemas define vocabularies that are reused in another XML Schema.
Possible targetNamespace declarations include the following:
<schema xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2java.com/name"
xmlns:target="http://www.java2java.com/name">
or
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2java.com/name"
xmlns="http://www.java2java.com/name">
In the first declaration, the <schema> element uses the default namespace.
Because of this the target namespace http://www.java2java.com/name requires the use of a prefix.
In the second declaration, the <schema> element requires the use of a prefix.
Because the target namespace http://www.java2java.com/nameis using a default namespace declaration.
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