An overflow leader is a special type of positioned subform that appears at the top of the next page whenever a page overflow occurs.Overflow leaders are similar to the heading row in a standard table. The heading row appears at the top of the table and contains a descriptive label for each of the columns in the table. You can format the table so that when it expands beyond one page, the heading row is repeated at the top of the new page. This makes the information in the table easier to understand as the reader moves from page to page.An overflow leader subform behaves in a similar way. When you specify that a specific subform will be the overflow leader for a subform that repeats, the overflow leader subform will appear once before the repeating subform at the top of the current page and each subsequent page thereafter.The repeating subform is added as many times as necessary when merged with data. When there is no more room on the first page, a new page is added and the data continues to flow into the next page until all the data is consumed. The overflow leader subform will appear once at the top of each page.You can see an example of how an overflow leader subform is used in the sample form design whose layout adjusts to accommodate data that is included with LiveCycle Designer ES. The sample, Purchase Order.xdp, is in the Samples folder where LiveCycle Designer ES is installed on your system. In that example, the subform named detailHeader acts as the overflow leader for the repeating subform named detail.Bookend leaders are subforms that appear before a repeating subform. If you define a subform sibling just above a repeating subform and then specify it as an overflow leader, you have defined it as a bookend leader and as an overflow leader.An overflow trailer appears at the bottom of the next page whenever a page overflow occurs. Use an overflow trailer to include information that appears only once, after all the data is positioned.Bookend trailers are subforms that appear just below a repeating subform. If you define a subform just below a repeating subform and then specify it as an overflow trailer, you have defined it as a bookend trailer and as an overflow trailer.