[xsl] Difference between xmlns:aaa= and xmlns:aaa:= in an XML Schema?

When I create a XSD Schema file then there are namespace declaration at the top 
similar to

xmlns:aaa:="http://.....";
xmlns:bbb="http://....";
targetNamespace="http://...";
elementFormDefault="qualified"
attributeFormDefault="qualified"
...

When do I have to write a "=" and when a ":=" ?

Ben



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