这样嵌套正常：
<present name="ContentNav">
<li <notin name="accordion" value="7,71,72,73,74">class="haveSub"</notin>>
<a class="navItem" href="
<present name="haveRules['Content-releaseList']"> {:U('Portal/Content/releaseList')}&app_key={$Think.get.app_key} <else/>
<present name="haveRules['Content-index']">{:U('Portal/Content/index')}&app_key={$Think.get.app_key} <else/>
{:U('Portal/Category/index')}&app_key={$Think.get.app_key}
</present>
</present> title="内容管理" target="_self">
<notin name="accordion" value="7,71,72,73,74"><span class="sprite_20x20 sprite_20x20_leftArrow pull-right"></span></notin>
<span class="sprite_20x20 sprite_20x20_content"></span>内容管理
</a>
</li>
</present>

再加一层嵌套就不正常了：
<present name="ContentNav">
<li <notin name="accordion" value="7,71,72,73,74">class="haveSub"</notin>>
<a class="navItem" href="
<present name="haveRules['Content-releaseList']"> {:U('Portal/Content/releaseList')}&app_key={$Think.get.app_key} <else/>
<present name="haveRules['Content-index']">{:U('Portal/Content/index')}&app_key={$Think.get.app_key}<else/>
<present name="haveRules['Category']">{:U('Portal/Mode/index')}&app_key={$Think.get.app_key}</present> //加的一层
</present>
</present> title="内容管理" target="_self">
<notin name="accordion" value="7,71,72,73,74"><span class="sprite_20x20 sprite_20x20_leftArrow pull-right"></span></notin>
<span class="sprite_20x20 sprite_20x20_content"></span>内容管理
</a>
</li>
</present>