Users are able to add notes, tags, and their own metadata through the in-browser interface and export reference library data as formatted bibliographies for use elsewhere.
用户可以在浏览器界面添加备注、标签和他们本身的元数据，也可以格式化书目的形式输出参考库数据，以便在别处使用。
If this conversion succeeds then other data like the interface ID, object UUID and annotation are retrieved from the inquiry context's reference.
如果转换成功，就从查询上下文引用获取接口id、对象uuid和注解等其他数据。
The implementation class name is never used by other layers of the data access application; they always reference and use the user-defined data access interface.
数据访问应用程序的其他层不会使用实现类的名称；它们总是引用和使用用户定义接口。
Overhead in memory is very small: You basically have a 4- byte overhead per interface (the vtable pointers in the object's instance data) plus 4 bytes for the reference counter.
内存开销非常小：基本上每个接口需要额外4个字节（对象实例数据里虚函数表指针），加上引用计数的4个字节。
Overhead in memory is very small: You basically have a 4- byte overhead per interface (the vtable pointers in the object's instance data) plus 4 bytes for the reference counter.
内存开销非常小：基本上每个接口需要额外4个字节（对象实例数据里虚函数表指针），加上引用计数的4个字节。
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