xml文檔中包含類似"Elements look like <this>"的文本，其中的"<this>"將被解析程序解釋成一個元素，而人們實際想要的是"<this>"所表示的原義文本。

1.CDATA區：它的全稱為character data,以"<![CDATA[ "開始，以" ]]>" 結束，在兩者之間嵌入不想被解析程序解析的原始數據，解析器不對CDATA區中的內容進行解析，而是

將這些數據原封不動地交給下游程序處理。

2.特殊字符 ：

xml 中表示：   <= 小于等于、    >= 大于等于 需加  這樣的標記：     <![CDATA[   ]]>      xml中有&的符號，需要<![CDATA[&]]>這樣表示&

<= 小于等于 ：<![CDATA[   <=  ]]>

>= 大于等于：<![CDATA[  >=  ]]>

一些特殊字符也可用下面的替代符號所代替。

 特殊字符   替代符號

     &            &amp;

     <            &lt;

     >            &gt;

     "             &quot;

     '              &apos;

eg.

<!--  鉆井日報使用sql   -->    <entry key="zjDailydrillrepCnQuery">     <map>      <entry key="sql">       <value>         select zjDailydrillrep.dailydrilrepid,                       zjDailydrillrep.wellbore_id,                       bore.well_legal_name,                       zjDailydrillrep.spudin_date,                       zjDailydrillrep.reportfor,                       zjDailydrillrep.depthmkb,                       zjDailydrillrep.tvdmkb,                       zjDailydrillrep.format_id,                       zjDailydrillrep.enginbrief,                       zjDailydrillrep.Dailywellcost,                       zjDailydrillrep.insert_date,                       zjDailydrillrep.status,                       zjDailydrillrep.comments,                       zjDailydrillrep.Submitter,                       zjDailydrillrep.Verifyer,                       rig.rig_no,                       zjDailydrillrep.Rothours,                       (select GEO.CURRENT_TD                          from LJ_DAILY_GEOLOGICAL_REPORT GEO                         where zjDailydrillrep.WELLBORE_ID = GEO.WELLBORE_ID                           and GEO.REPORT_DATE = zjDailydrillrep.REPORTFOR                           and geo.half_full = '260002' and rownum<![CDATA[<=1 ]]> ) td,    --------表示rownum <=1                                              (select GEO.CURRENT_TD                          from LJ_DAILY_GEOLOGICAL_REPORT GEO                         where zjDailydrillrep.WELLBORE_ID = GEO.WELLBORE_ID                           and GEO.REPORT_DATE = zjDailydrillrep.REPORTFOR - 1                           and geo.half_full = '260002'  and rownum<![CDATA[<=1 ]]> ) tdbefore                  from zj_Dailydrillrep zjDailydrillrep                  left join COMM_WELLBORE BORE                    on bore.wellbore_id = zjDailydrillrep.wellbore_id                  left join zj_rig_data rig                    on rig.rig_id = bore.rig_id                 where 1 = 1

       </value>      </entry>     </map>    </entry>