It is the computer which take care of suitable interface as if differents system in the network have the same data format. No classfication What becomes a problem first when we are going to build a database is data format. Especially it always becomes a problem how are we going to make classification. There are lots of classification system even in a library. However, although it depends on the field, classification does not have so much meanings when ordinally people are searching objects.
Classification is mainly for convenience of a library or a museum to put and keep objects in order.
For users, it will be sufficient if they can search the book or the object they want from author's name, book title, printing company, name of the object, or area, etc. Furthermore, each museum already has each formal and each classification system, so it is impossible to standardize them in fact. Therefore let us leave their format and classification system as they are. The best way to make different data format as if they are the same is to put data in free style using natural language. After that, they make searching by using high speed full-text searching system.