xml转换从多个xmls中提取元素并放入单个xml

Question

我有4个类似的xml文件。唯一的区别是价格标签。

文件1

<?xml version="1.0" encoding="UTF-8"?>
<FILE batchNo="ProductPrice_20161130120718453" changeId="1">
  <ROOT transactionNo="1">
    <PRICE docNo="1">
      <ITEMID type="1">A210BK001</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="SGD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">333.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
    <PRICE docNo="2">
      <ITEMID type="1">A210BK002</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="SGD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">333.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
  </ROOT>
  <END_OF_BATCH/>
  <END_OF_PROCESSING/>
</FILE>

文件2

<?xml version="1.0" encoding="UTF-8"?>
<FILE batchNo="ProductPrice_20161130120718453" changeId="1">
  <ROOT transactionNo="1">
    <PRICE docNo="1">
      <ITEMID type="1">A210BK001</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="USD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">125.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
    <PRICE docNo="2">
      <ITEMID type="1">A210BK002</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="USD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">125.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
  </ROOT>
  <END_OF_BATCH/>
  <END_OF_PROCESSING/>
</FILE>

文件3

<?xml version="1.0" encoding="UTF-8"?>
<FILE batchNo="ProductPrice_20161130120718453" changeId="1">
  <ROOT transactionNo="1">
    <PRICE docNo="1">
      <ITEMID type="1">A210BK001</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="AUD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">175.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
    <PRICE docNo="2">
      <ITEMID type="1">A210BK002</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="AUD18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">175.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
  </ROOT>
  <END_OF_BATCH/>
  <END_OF_PROCESSING/>
</FILE>

文件4

<?xml version="1.0" encoding="UTF-8"?>
<FILE batchNo="ProductPrice_20161130120718453" changeId="1">
  <ROOT transactionNo="1">
    <PRICE docNo="1">
      <ITEMID type="1">A210BK001</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="GBP18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">90.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
    <PRICE docNo="2">
      <ITEMID type="1">A210BK002</ITEMID>
      <FROM_DATE>2016113012071800+0000</FROM_DATE>
      <PRICES price_band="GBP18">
        <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">90.0</PRODUCT_PRICE>
      </PRICES>
    </PRICE>
  </ROOT>
  <END_OF_BATCH/>
  <END_OF_PROCESSING/>
</FILE>

输出文件

  <?xml version="1.0" encoding="UTF-8"?>
    <FILE batchNo="ProductPrice_20161130120718453" changeId="1">
      <ROOT transactionNo="1">
        <PRICE docNo="1">
          <ITEMID type="1">A210BK001</ITEMID>
          <FROM_DATE>2016113012071800+0000</FROM_DATE>
          <PRICES price_band="AUD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">175.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="GBP18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">90.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="SGD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">333.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="USD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">125.0</PRODUCT_PRICE>
          </PRICES>
        </PRICE>
        <PRICE docNo="2">
          <ITEMID type="1">A210BK002</ITEMID>
          <FROM_DATE>2016113012071800+0000</FROM_DATE>
          <PRICES price_band="AUD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">175.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="GBP18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">90.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="SGD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">333.0</PRODUCT_PRICE>
          </PRICES>
          <PRICES price_band="USD18">
            <PRODUCT_PRICE price_code="3" unit_of_sale_qty="1">125.0</PRODUCT_PRICE>
          </PRICES>
        </PRICE>
      </ROOT>
      <END_OF_BATCH/>
      <END_OF_PROCESSING/>
    </FILE>

我想从这4个不同的xmls中挑选个别价格区段并将其强制转换为单个xml。这样做的最佳方法是什么？

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