Java大XML高效转换：将PurchaseHistory的Type属性复制至StoreTransaction

我需要完成以下XML转换操作：

• 将每个<PurchaseHistory>父节点的Type属性复制到它的所有子节点<StoreTransaction>中
• 移除所有<PurchaseHistory>节点

输入XML示例： #

<ArrayOfStoreTransaction CustomerID="C1">
    <PurchaseHistory Type="purchase.001" Count="2">
        <StoreTransaction>
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction>
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
    <PurchaseHistory Type="purchase.002" Count="1">
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
    <PurchaseHistory Type="purchase.003" Count="2">
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
</ArrayOfStoreTransaction>

输出XML示例： #

<ArrayOfStoreTransaction CustomerID="C1">
        <StoreTransaction Type="purchase.001">
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.001">
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.002">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.003">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.003">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
</ArrayOfStoreTransaction>

由于待处理的XML文件体积超过200MB，常规DOM解析会占用过多内存，因此寻求Java环境下兼顾内存占用与执行效率的XML处理库，来高效完成上述转换。

内容的提问来源于stack exchange，提问作者Adnan