XML namespaces allow schema designers to uniquely identify elements and attributes using namespaces. Namespaces are attached to element and attribute names using prefixes, which reference URIs. Prefixes can be changed, but as long as the URI referenced by the prefix remains the same, the element or attribute will still be considered the same.
XML Authority's Namespaces tab, available only for schemas that support namespaces, lets you specify mappings between the prefixes used in the schema and the namespace URIs they represent, as shown in Figure A.
Figure A - Namespaces tab of the Advanced Pane
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