How To Describe The Co-existence Of Different User Interfaces In The DBMS Environment?
A community of users
generally includes anyone from a first time novice to an experienced
user who is developing sophisticated application systems for other end
A comprehensive dbms should provide interfaces appropriate to this broad spectrum of users. Yet there should be uniformity in underlying dbms functions and the semantics of the interfaces. For the same dbms, it is possible to have several different user interfaces:
- System driven interface with menus and prompts for the novice users and liberal use of help facilities.
-User driven interface with an ad hoc command language.
-An extended command language for building command files for deferred execution.
-Natural language interface for the casual user.
The question becomes
Where to focus design and development effort? What can be built on top
of what? From the standpoint of systems architecture, a system driven
dialogue can be built on top of a command driven interface. Menu and
prompting dialogues essentially capture all the necessary information
that would otherwise be expressed in one or more commands. Similarly,
a natural language interface for the casual user can be built on top
of the command level. The natural language interface is still a user
driven interface but for the intermittent user. They are not assumed
to be able to correctly formulate a command to the system.
Therefore, dialoguing facilities are provided which allow the user to express a command in their natural language with all its ambiguities and contextual dependencies. The system then attempts to interpret the command, asking the user to resolve ambiguities and provide missing information. The output from the natural language processor is a correctly formulated command which can be executed by the formal command processor of the dbms.
There is some question whether novice of intermittent users should have a natural language interface where they attempt to initiate dialogue with the system, or a system driven interface where they are led through the use of the system by a series of menus and prompts. The latter may prove to be easier and more efficient for such users. Since all other user interfaces essentially construct a command for the user, it is important to design and implement a complete and comprehensive language first.
For a comprehensive
dbms, all user modes should be supported. Furthermore a user should
be able to change interfaces as appropriate depending on their general
level of knowledge of the system and their experience with the particular
function being performed. Any request should be expressible either as
a command or using system driven prompts and menus. For human efficiency,
the command language should have a narrative symantic style. However,
for machine efficiency, the command language should be fixed position
with encoded command verbs. Therefore, it is desirable to have an intermediate
command language into which all other interfaces are translated before
being stored or executed.
The intermediate command language would store commands in a condensed fixed format. Of course, the language would still be a high-level structured, data language. The user interfaces manage all dialogue with the user. This includes scanning and parsing the input, syntax checking and messages for syntax errors. The command manager receives syntactically correct commands, loads the appropriate program code to execute the command if necessary and initiates execution of the command that is the dbms function.
The above paragraph is intended only to give a brief glimpse into a possible architecture for accomplishing the objective of separating the user interface modes from the dbms functions, and of a users being able to freely move among the different interfaces.
The following discussion of menu handling gives specific ideas on the integration of commands and menus. In choosing between menu driven or command driven, this usually demonstrates a dbms functional capability using an illustrative command language statement. Furthermore, the emphasis is on the semantics of the language statement rather than the particular syntax. This is done recognizing that menus and prompts can be built on top of the command language to capture all the information and parameters required to perform the function.
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