它尝试装入后一个文件，然后抽取出文件的标题和子标题以创建超链接。
It attempts to load the latter file and extracts its title and subtitle to create a hyperlink.
安装应该找到一个合适的替代它的正常运作，因为它检查文件的标题。
Installed should find it a suitable replacement which works properly as it examines the file's header.
文件的状态，通过各文件的标题、唯一文件编号、发放日期和修订级别等信息进行控制。
Document status is controlled by reference to their title, unique document number, date of issue and revision level.
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