Created by Jerry Wang, last modified on Jul 02, 2014
用于测试的xml:
<catalog>
<cd>
<title>Empire Burlesque</title>
<artist>Bob Dylan</artist>
<country>USA</country>
<company>Columbia</company>
<price>10.90</price>
<year>1985</year>
</cd>
<cd>
<title>Hide your heart</title>
<artist>Bonnie Tyler</artist>
<country>UK</country>
<company>CBS Records</company>
<price>9.90</price>
<year>1988</year>
</cd>
</catalog>
line 6: 匹配xpath /catalog/cd下面的所有节点.
line 11:如果找到title节点，则将该节点整个copy到输出:
如果替换成copy:
则只有title节点本身加到输出: