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!!! Overview[1]
[{$pagename}]s are used for providing uniquely [named elements|namespace] and attributes in an [XML] document. They are defined in a [W3C] recommendation.
An [XML] instance may contain element or attribute names from more than one [XML] vocabulary. If each vocabulary is given a [{$pagename}], 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:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [XML_namespace|Wikipedia:XML_namespace|target='_blank'] - based on information obtained 2016-07-04-