<root>
<childNode attribute1="value1">
<grandChildNode attrib1="val1" attrib2="val2">some content1
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content2
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content3
</grandChildNode>
</childNode>
<childNode attribute1="value1">
<grandChildNode attrib1="val1" attrib2="val2">some content1
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content2
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content3
</grandChildNode>
</childNode>
<childNode attribute1="value1">
<grandChildNode attrib1="val1" attrib2="val2">some content1
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content2
</grandChildNode>
<grandChildNode attrib1="val1" attrib2="val2">some content3
</grandChildNode>
</childNode>
</root>
使用DOM获取根节点,然后遍历childNode和grandChildNode是否高效,还是使用XPath表达式来收集子节点和孙子节点的详细信息更高效?