Hints and tricks for Oracle and other stuff...

select
         XMLQuery(
          'for $i in /DOK/CommRecord
           where $i/CommType != "EMAIL"
            order by $i/CommType
            return $i/CommDate'
         passing by value XMLType('<DOK>
   <CommRecord>
      <CommType>LETTER</CommType>
      <CommDate>3/12/2005</CommDate>
      <CommText>Dear Mr Jackson</CommText>
   </CommRecord>
   <CommRecord>
      <CommType>PHONE</CommType>
      <CommDate></CommDate>
      <CommText>Dear Ms Potter</CommText>
   </CommRecord>
   <CommRecord>
      <CommType>EMAIL</CommType>
      <CommDate>3/11/2005</CommDate>
      <CommText>Dear Mr Smith</CommText>
   </CommRecord>
   </DOK>')
         returning content) XDetails
   from dual
/