AFAIK your var myxml already refers to the root node of your XML document.  

So your first example searches for a tag called "level1" inside the root 
tag (which is "level1").  Obviously, there is no such node and the text is 
empty.

Your second example extracts a textual representation of the child nodes 
(plural) of tag "level2".

The third example references the tag "level3a" inside the tag "level2" and 
extracts the text, which contains no more child nodes but just the text.

Hope that helps
Stefan

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