TJ wrote:
> Peter, I have one more question in A case...
> 
> Just want to make sure whehter my understanding is correct.
> 
> So..basically, in A case,  root element(/hello-world) wasn't found in the 
> template...

Right.

> so default rule kicks in and traverse the all child nodes..which are
> (greeting and greeter)...

Correct. The direction of traversal is depth-before-width, so if you 
consider the document as a tree (silly name, because it's upside-down!)
[Use fixed-width font for this, eg Courier]

                           document root
                                  |
                     root element (hello-world)
                                  |
                    +-------------+------------+
                    |                          |
                greeting                    greeter
                    |                          |
              character data             character data

So the sequence is:
document root
root element
greeting
character data [no more depth, go back up]
greeter
character data [end]

> By match="/hello-world/greeting" statement in A.xsl,  it does match greeting 
> child element of hello-world, which is root...

Only because it matches the greeting in the case where greeting is a 
child of hello-world. The presence of the "/hello-world/" does NOT force 
this template to use that element in a particular sequence. Consider the 
"/hello-world/" as more like a condition "greeting provided that the 
parent is hello-world". It simply stops it being matched if a different 
greeting element exists somewhere else in the document with a different 
parent element type. It does NOT mean that hello-world will get 
processed on the way to greeting.

(Actually this is only partially true, but you don't need to worry about 
the rest yet :-)

> so it prints by xsl:value-of 
> select..like <div>..</div>....Then greeter is printed by default template 
> rule....
> 
> Is my understanding correct?

Yes. But I think you might want to look at books on XML hierarchical 
document structure and XSLT processing at this stage.

///Peter
-- 
XML FAQ: http://xml.silmaril.ie/