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There was no reason why this should not have been allowed in 1.0, but the mistake has been rectified in 1.1.It is necessary to know this difference because not many XML parsers yet support Namespaces in XML 1.1.Although there were some differences in unbinding prefixed namespaces, both versions allow you to unbind or remove the already declared by overriding it with another declaration, where the namespace in the overriding declaration is empty.
But in this case, if say, the schema is modified by making some local declarations global and/or making some global declarations local, then all instance documents are affectedand the instance is no longer valid.Just as shelves partition the entire space in a refrigerator, the symbol spaces partition the namespace.There are three primary partitions in a namespace: one for global element declarations, one for global attribute declarations, and one for global type declarations (complex Type/simple Type).Regardless of what we choose, the entire instance would be validated. , we are specifying that all the elements and attributes in the instance must have a namespace, which in turn adds namespace complexity to instance.If say that the schema is modified by making some local declarations global and/or making some global declarations local, then the instance documents are not affected at all.
One of the primary motivations for defining an XML namespace is to avoid naming conflicts when using and re-using multiple vocabularies.