转:http://blog.csdn.net/lgm97/article/details/6409225
<!-- form digest 安全控件用来进行form的安全校验-->
<asp:ContentPlaceHolder id="PlaceHolderFormDigest" runat="server">
<SharePoint:FormDigest runat="server"/>
</asp:ContentPlaceHolder>
<!-- ===== 隐藏的placeholder ============================================================ -->
<asp:Panel visible="false" runat="server">
<!-- ===== 这些placeholder一般情况下不会输出任何东西 ========== -->
<!-- 在顶部导航栏中的导航菜单 -->
<asp:ContentPlaceHolder id="PlaceHolderHorizontalNav" runat="server"/>
<!-- The top navigation where GlobalNavigationSiteMap is contained. Gets overridden by default. V4 uses it to change the top nav -->
<asp:ContentPlaceHolder id="PlaceHolderTopNavBar" runat="server"/>
<!-- 快速导航的头 -->
<asp:ContentPlaceHolder id="PlaceHolderQuickLaunchTop" runat="server"/>
<!-- 快速导航的底. -->
<asp:ContentPlaceHolder id="PlaceHolderQuickLaunchBottom" runat="server"/>
<!--放置填入左导航的数据源 -->
<asp:ContentPlaceHolder id="PlaceHolderLeftNavBarDataSource" runat="server" />
<!-- 当页面上有日历时用到的时间选择器 -->
<asp:ContentPlaceHolder id="PlaceHolderCalendarNavigator" runat ="server" />
<!-- The top section of the left navigation bar. 左导航的顶部 -->
<asp:ContentPlaceHolder id="PlaceHolderLeftNavBarTop" runat="server" />
<!-- 用来override全局站点地图?-->
<asp:ContentPlaceHolder id="PlaceHolderGlobalNavigationSiteMap" runat="server" />
<!-- ===== 这些placeholder并不以2010UI的部分出现,但必须出现以向后兼容
========== -->
<!-- 当前页面所在的站点名 -->
<asp:ContentPlaceHolder id="PlaceHolderSiteName" runat="server"/>
<!-- 页面左上角的图标-->
<asp:ContentPlaceHolder ID="PlaceHolderPageImage" runat="server"/>
<!--标题区域的左边框 -->
<asp:ContentPlaceHolder ID="PlaceHolderTitleLeftBorder" runat="server"/>
<!-- mini console- supplementary buttons for pages like the wiki / history / incoming links -->
<asp:ContentPlaceHolder id="PlaceHolderMiniConsole" runat="server"/>
<!-- Right margin of the title area 标题区域的右边距 -->
<asp:ContentPlaceHolder id="PlaceHolderTitleRightMargin" runat="server"/>
<!-- 标题区域左侧的分隔区 -->
<asp:ContentPlaceHolder ID="PlaceHolderTitleAreaSeparator" runat="server"/>
<!-- 左导航区域的宽度-->
<asp:ContentPlaceHolder ID="PlaceHolderNavSpacer" runat="server"/>
<asp:ContentPlaceHolder id="PlaceHolderLeftNavBarBorder" runat="server"/>
<!-- 页面主体的边框元素 -->
<asp:ContentPlaceHolder ID="PlaceHolderBodyLeftBorder" runat="server"/>
<!--页面主体的右边距-->
<asp:ContentPlaceHolder id="PlaceHolderBodyRightMargin" runat="server" />
</asp:Panel>