Living in the Internet age, we find ourselves more and more frequently confronting information systems that fail the relational database litmus: We can neither define information in advance, nor can we reliably stick to any definition we might conjure up.

• 我们生活在互联网时代，越来越发现自身经常面对不适用关系数据库要求的信息系统。 我们既不能提前定义信息，也不能可靠地坚持我们想像的定义。