The content of elements must consist of well-formed character data or markup

iBatis 는 XML 형식이기 때문에 부등호가 들어간 쿼리를 사용할때 에러가 발생한다.
The content of elements must consist of well-formed character data or markup.
이럴때에는 부등호가 들어간 쿼리를 <![CDATA[ 쿼리 ]]> 로 감싸줘야 한다.

select
  ROWNUM, no2, writer2, title2,
  regdate2, hit2, contents2, upfile2,
  password2, recommend2, category2
from
  (select
      ROWNUM, no2, writer2, title2, to_char(regdate2,'yyyy-mm-dd') as regdate2,
      hit2, contents2, upfile2, password2, recommend2, category2
   from twice_board
   order by hit2 DESC
  )
where <![CDATA[ROWNUM<=3]]>