How can I wrap a group of adjacent elements using XSLT?

Question

I have some XML with elements, and I\'d like to wrap any consecutive runs with elements. So, source XML would look so

Answer 1

This transformation:

when applied on the provided XML document:

  Heading
  Blah
  item 1
  item 2
  item 3
  item 4
  Something else

produces the wanted result:

    Heading
    Blah
    
        item 1
        item 2
        item 3
        item 4
    
    Something else