An XML instance may contain element or attribute names from more than one XML vocabulary. If each vocabulary is given a XML namespace, the ambiguity between identically named elements or attributes can be resolved.
A simple example would be to consider an XML instance that contained references to a customer and an ordered product. Both the customer element and the product element could have a child element named id. References to the id element would therefore be ambiguous; placing them in different namespaces would remove the ambiguity.
More Information#There might be more information for this subject on one of the following:
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- XML Schema Definition Language