文件结尾的skip语句表明，在记号之间可以出现空白(空格、跳格、回车和换行)，空白将被忽略。
The SKIP statement at the end of the file says that white space (blanks, tabs, carriage returns, and line feeds) can occur between tokens and is to be ignored.
STMTKEY 元素中定义的语句必须精确匹配其访问计划必须受到影响的语句，但是允许出现不同的空白。
The statement defined in the STMTKEY element must exactly match the statement whose access plan must be influenced, although differences in whitespaces are tolerated.
约定的可读性目标包括使用断行、将空格当做制表符和空白对待，以及条件语句的格式。
Conventions aimed at readability includes such things as the use of line breaks, treatment of whitespace like tabs and Spaces, and the formatting of conditional statements.
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