meaning of xmlns at top of xaml file

[mp]

i've looked through help and can't find the meaning of this keyword or
whatever it is...
there are lots of hits using xmlns but none of them address this question...
when i start a wpf project these two lines are at the top of file...
is there a link to an explanation of exactly what they are doing
created by the ide...
xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation <---appears
to point to a website?

xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml <---creating a variable
x and pointing to a site?

created by me...

xmlns:ds="clr-namespace:WpfApplication1" <---creates a variable ds and
creates or points to a namespace in the current project?

thanks

mark

 

[Peter Duniho]

i've looked through help and can't find the meaning of this keyword or
whatever it is...

http://www.w3.org/TR/REC-xml-names/

 

[mp]

http://www.w3.org/TR/REC-xml-names/

fantastic link, thanks much
so much to learn, so little time

mark