数据库目录包含每个文件的结构，每条数据项的类型和存储格式，以及针对数据的不同约束等信息。
Program-data independence:It is a property of database system that the structure of data file is stored in the DBMS catalog separately from the access programs.
这些子类型的基本区别和命名的原因是磁盘上FAT机构目录项比特数的大小。
The basic difference in these FAT sub types, and the reason for the names, is the size, in bits, of the entries in the actual FAT structure on the disk.
每个目录项都有一个名字和类型与它的所属目录相关联，也就是UID所显示出来的东西。
Each directory entry has a name which is relative to its owning directory and a type, which is indicated by its unique identifier (UID).
列表样式类型属性指定目录项标记的类型，并且如果使用列表样式图像是没有的，或者图像加载被关闭。
The list-style-type property specifies the type of list-item marker, and is used if list-style-image is none or if image loading is turned off.
列表样式类型属性指定目录项标记的类型，并且如果使用列表样式图像是没有的，或者图像加载被关闭。
The list-style-type property specifies the type of list-item marker, and is used if list-style-image is none or if image loading is turned off.
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