namespace question

idle curiosity:

what point of asterix entries in xml namespace (i
tried google this, other undecipherable xml.org
document, not find how using named , unamed
wildcards:

for, example:
<mx:application xmlns:mx=" http://www.adobe.com/2006/mxml"

xmlns:yahoo="com.yahoo.maps.api.flex.*" xmlns:local="*" xmlns="*">

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