然后每张卡片可以在它的文本字段、图片字段里面容纳各种数据，就像数据库一样。
Each card then could contain different data in the text or picture fields, as in a database.
为这些卡片给出合适的估算大小也很困难：例如更新一台服务器上的应用程序库时会不会影响到看似不相干的领域？
And giving these stories sizes was difficult to say the least, since estimation is often difficult - will updating a lib on a server affect other seemingly unrelated areas?
具体的一本本书构成了整个数据库，而这些目录卡片则构成了元数据库。
The actual books constituted the data, the catalogue cards the metadata.
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