XSLT combine multiple nodes into single node

Question

 
  Sydney Office
  SYDNEY
  

        

Answer 1

This transformation:

when applied on the provided source XML document:

 
  Sydney Office
  SYDNEY
  Peak Night
  PEANIG
  30849.3
  9
  16.35
  19
 

produces the wanted, correct result:

   
      Sydney Office
      SYDNEY
      Peak Night
      PEANIG
      
         20050703
         30849.3
         9
      
      
         20050710
         16.35
         19
      
   

when applied on the second provided XML document, requested in an Update by the OP:

 
  Sydney Office
  SYDNEY
  Peak Night
  PEANIG
  30849.3
  16.35
  19
 

again the wanted, correct result (No element is generated if the immediate sibling isn't a W_nnnnnnnn_Spots) is produced:

   
      Sydney Office
      SYDNEY
      Peak Night
      PEANIG
      
         20050703
         30849.3
      
      
         20050710
         16.35
         19
      
   

Do note:

1. The use of the identity rule to copy any node "as-is".

2. The overriding of the identity template only for W_nnnnnnnn_Dlr elements.

3. The overriding of the identity template with an empty template matching W_nnnnnnnn_Spots elements.

4. The use of the standard XPath functions: name(), starts-with() and substring-after()

5. The function ends-with() is only available in XPath 2.0 (XSLT 2.0) and isn't used in this XSLT 1.0 solution.