Declares a stream and is thereby able to associate a stream name
    with its RSE. This provides Oracle Rdb with the context needed
    to place the elements of the START_STREAM...FETCH...END_STREAM
    construct across a programming module in any order.

    Example:

    DECLARE_STREAM CURRENT_INFO_STREAM USING
      CI IN CURRENT_INFO SORTED BY DESCENDING CI.SALARY