Re-Organize aan XML Nod Tree

Hi
I am new to XML so clarity in your explanation will be greatly appreciated.
I have the response from an XML soap message that has in it many occurrences of the parent node named "<establishment>"
The XML document may contain one or more occurrences of the child nodes named "<room>" under the parent node named "<establishment>".
I need a conditional "if then" statement that tests to see if there are more than one child "<room>" node under the parent node "<establishment>". If there is only one found then the next"<establishment node needs to be tested and so on. If the test finds that there are more than one occurrence of the "<room>" node then a new parent node named "<establishment>" should be created and the content of one occurrence of the "<room>" node from the original "<establishment>" node should be inserted into the newly created "<establishment>" node along with all of the other nodes that were in the original "<establishment>" node. This should happen for each occurrence of  "<room>" node that is found.

I need the code that will take this XML document below and transform it to the XML document list at the end o this posting:

<establishment>
   <room>
     <code>DBL.SU</code>
     <description>DOUBLE/ TWIN SUPERIOR</description>
     <availability>999</availability>
     <price>
           <occupancy>
                 <adults>2</adults>
                 <children>0</children>
                 <rooms>1</rooms>
           </occupancy>
     <board_type>
           <code>HD</code>
           <description>BED AND BREAKFAST</description>
     </board_type>
     <amount>386.54</amount>
     </price>
  </room>
  <room>
     <code>DBL.SU</code>
     <description>DOUBLE/ SUITE</description>
     <availability>999</availability>
     <price>
           <occupancy>
                 <adults>2</adults>
                 <children>0</children>
                 <rooms>1</rooms>
           </occupancy>
     <board_type>
           <code>HD</code>
           <description>BED AND BREAKFAST</description>
     </board_type>
     <amount>346.21</amount>
     </price>
  </room>

and transform it into this XML format;

<establishment>
   <room>
     <code>DBL.SU</code>
     <description>DOUBLE/ TWIN SUPERIOR</description>
     <availability>999</availability>
     <price>
           <occupancy>
                 <adults>2</adults>
                 <children>0</children>
                 <rooms>1</rooms>
           </occupancy>
     <board_type>
           <code>HD</code>
           <description>BED AND BREAKFAST</description>
     </board_type>
     <amount>386.54</amount>
     </price>
  </room>
</establishment>
<establishment>
   <room>
     <code>DBL.SU</code>
     <description>DOUBLE/ TWIN SUPERIOR</description>
     <availability>999</availability>
   <room>
     <code>DBL.SU</code>
     <description>DOUBLE/ SUITE</description>
     <availability>999</availability>
     <price>
           <occupancy>
                 <adults>2</adults>
                 <children>0</children>
                 <rooms>1</rooms>
           </occupancy>
     <board_type>
           <code>HD</code>
           <description>BED AND BREAKFAST</description>
     </board_type>
     <amount>346.21</amount>
     </price>
  </room>
</establishment>

Thanks in advance
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