Consider the following XML:
请考虑以下XML：
<root>
<steps>
<step>1</step>
<step>2</step>
<step>3</step>
<step>4</step>
</steps>
<stepDetails step="1">Details</stepDetails>
<stepDetails step="2">Details</stepDetails>
<stepDetails step="3">Details</stepDetails>
</root>
<roo
