XMLDOM ! Confusion

Hi everybody,

I know that i should buy some book about the XML the sooner the better, but
before do that i would like to study something by my own and....i would have
few questions for you.
So, i use Microsoft XMLDOM  to put together my "fantastic" XML files and XSL
files together and i would like to know if XMLDOM is a parser or a processor
or both.
Moreover i noticed that in all xsl file the statement "xsl:stylesheet
xmlns:xsl="http://www.w3.org/TR/WD-xsl" is compulsory.
What is the meaning of that statement ?
I think it is a kind of model of XSL language or something.
Oh, just another question what is the meaning of the following code :

                                                        <xsl:template>
 
<xsl:apply-template/>
				        <xsl:template>

Cheers.

                                                             Stefano	


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