MyBatis Map foreach 拼接的问题

AND (
    INSTR(language_skills, '1') > 0
    OR INSTR(language_skills, '3') > 0
)  

我想实现这种情况的 动态拼接  

我自己写的是 
    <if test="language_skills!= null and language_skills!= ''"> AND
    <foreach
            collection="language_skills" index="index" item="item" open="(" separator="OR" close=")">
                    INSTR(language_skills, ${item})  &gt; 0
              </foreach>
            </if>

                            结果报错 求大神帮忙

http://blog.csdn.net/linminqin/article/details/39154133