MyBatis xml里面foreach标签里面的属性separator写逗号还是or

 <if test="myList != null">
            AND dm in
            <foreach collection="myList " item="item" open="(" separator="," close=")">
                #{item , jdbcType=VARCHAR }
            </foreach>
        </if>

AND dm in ( '03' , '04')

    <if test="myList != null">
            AND
            <foreach collection="myList " index="index" item="item" open="(" separator="or" close=")">
                dm  = #{item , jdbcType=VARCHAR }
            </foreach>
        </if>

AND ( dm  = '01'or dm   = '02' or dm   = '03')