XML XPATH 解析

<?xml version="1.0" encoding="utf-8"?>
<root>
<list>
<catalog id="1" catalogname="业界新闻" catalogtype="1" orders="1" comment=""/>
<catalog id="2" catalogname="汽车新闻" catalogtype="0" orders="2" comment=""/>
<catalog id="3" catalogname="军事新闻" catalogtype="1" orders="3" comment="">
军事新闻备注
</catalog>
<catalog id="4" catalogname="法制新闻" catalogtype="1" orders="4" />
<catalog id="5" catalogname="房产新闻" catalogtype="0" orders="5" />
<catalog id="6" catalogname="其他新闻" catalogtype="0" orders="6" comment="">
</list>
</root>1).写出读取 orders 大于3且catalogtype="0" 的catalog节点的xpath ?2).写出读取 catalogname="军事新闻" 的catalog 节点text 的xpath ?3).写出 catalogname以 "房产" 开始 的catalog 节点的xpath ?4).写出 catalogname包含 "军事" 的catalog 节点的xpath ?5).写出不包含 comment属性 的catalog 节点的xpath ?