占位符

• Method generates the markup for a placeholder that specifies the
  方法生成一个占位符标记，该占位符指定
• You establish the format of the placeholder name by setting the
  属性，可以建立该占位符名称的格式。将
• A proxy in its general form is a placeholder for another object
  通常来说，代理是另一个对象的占位符。
• The empty node is basically a placeholder that does nothing
  Empty节点其实是一个占位符，它什么都不做。
• Performs an insert by substituting
  通过替换指定占位符的
• Is a placeholder that indicates multiple trace flags can be specified
  表示可指定多个跟踪标志的占位符。
• Subscripts differentiate multiple instances of the same placeholder
  下标用于区别同一占位符的多个实例。
• Represent placeholders that must be replaced with appropriate values
  表示必须使用相应的值替换的占位符。
• Legacycatalog is an application placeholder for the old catalog
  Legacycatalog是旧目录的应用程序占位符。
• Each view is represented by an instance of the placeholder portlet
  每个视图都由占位符portlet实例来表示。