1. "/"
/AAA:
<AAA>
<BBB/>
<DDD>
<BBB/>
<DDD>
<CCC/>
<AAA>
/AAA/CCC:
<AAA>
<BBB/>
<CCC/>
<DDD>
<BBB/>
<DDD>
<CCC/>
<AAA>
/AAA/DDD/BBB:
<AAA>
<BBB/>
<CCC/>
<DDD>
<BBB/>
<DDD>
<CCC/>
<AAA>
伊图教程网[www.etoow.com]
http://www.etoow.com/html/2009-04/1240010435.html
2. "//"
ASP.NET 2.0中使用XML时XPath的语法
'http://www.etoow.com/html/2009-04/1240010435.html