RSS : a "namespace" in itself ?

Hi, 
 
I try to be precise in a generic and popularized RSS definition for non
coders. 

RSS is an XML dialect. It can handle external namespaces declared by "xmlns"
attributes. 

But, hum, do you consider RSS as "namespace" in itself ? Or is it incorrect
to use this word. 

In fact, I try to explain "namespace", in an RSS/Atom and modules/extensions
view, describing it as a group of elements all possibly used in a specific
goal, and needing to be declared to avoid polysemic confusion. 

But how would you explain that RSS is a namespace... but that you don't have
to declare it the usual way...  (with "xmlns") ? Is the "<rss
version=2.0>... </rss>" section enough to say that the RSS namespace is the
basic namespace I the newsfeed ?

Thanks

secou


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