[xsl] how to select elements based on optional container argument

XSLT 1.0 is a constraint.

I'm having trouble with a select expression to select the marked elements 
(<!--X-->) in the following XML:

<container select="2">
  <item>...</item><!--X-->
  <item>...</item><!--X-->

  <item>...</item>

</container>
<container>

  <item>...</item><!--X-->

  <item>...</item><!--X-->


  <item>...</item><!--X-->


</container>

<container select="1">

  <item>...</item><!--X-->
  <item>...</item>

  <item>...</item>

  <item>...</item>

</container>

In the case of a no select attribute all items in the container should be in 
the node set.
If there is a attribute select="n", only the first "n" items should be in the 
node set.
The expression needs to work across all containers.

There is the additional constraint that only items with parent container are to 
be selected.


Where could I start to look for code examples that solves a similar problem?

Thanks in advance for your help.




      
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