There's a further problem with databases: all database records are of a single, predefined type, and all instances of a record type are grouped together.
数据库还存在更多的问题，所有数据库记录有单一的预定义的类型，一种记录类型的所有实例被组织在一起。
It depends on predefined symbol and type definitions and is not easily modified or extended.
它依赖于预定义的符号和类型定义，并且不容易进行修改或扩展。
When the document of a particular type is uploaded, all these predefined parameters come into effect.
当上传特定类型的文档时，所有这些预定义的参数都将生效。
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