Page  221 ï~~VARIATIONS: A HYPERMEDI INTEGRATED ACCESS TO r Michael Burroughs Department of Computer Science Indiana University Btoomington, IN 47405 U.S.A. burrough@ cs.indiana.edu ABSTRACT: T he VARIATIONS project is object oriented database engine with a graphi VARIATIONS is designed using a client / into two distinct parts. The database engin and controls all data manipulation. The dis responsible for display information Communication between the two consists ol ai t -nt aThanIa: rn1,nt:_ -p. r

Page  222 ï~~The display manager maintains the VARI provides five different windows, each specialized tc 1) The TEXT window is used to display in addition to allowing the user to browse thrc window will allow for creating and editir interface. Additional functionality will link simple entry of printed material. The text, which will allow for the execution s language, based on the standard programmi to program lessons in which user input can t appearance of other windows can be sched 2) The GRAPHIC window is used to displ window will provide a complete set of dra creation and editing. In addition a scanne entry of printedimages. 3) The SCORE window will interpret the i

Page  223 ï~~VARIATIONS ability to associate one object a very dynamic method for moving between various p the handles of the related objects, as well as informatioi why the association constitutes a link. was made. This block of info Each window displays this link appearing on the screen. Activating a link button will t author and description, as well as bringing up the appJ in the linked object. windows of any type. By exploring various link patt There is no limit to the numb time. Although the information contained within th to the user to belong to two different classes: 1) linkinl object with a catalog window entry (hereafter called a SCORE, GRAPHIC SOUNDS objects together (hereafter called a content link). CATALOG LINKS

Page  224 ï~~The first group of people include those in cha and those individuals who have been specifically a Additionally, only the managers of the system can m internal consistancy in the use of bibliographic objec The second group of users is designed with special links visible to only an instructor, or a class electronic classroom bulletin board. Instructors and s class material and is relavant only in that setting. L available. This also gives the instructor control over keeping the information base in sync with the presen also add new objects to the database demonstrating material. These objects can remain private until the choose to make them visible to everyone. The third group includes the general user. I established by those in the first group. These use information base, but can benefit from additions mad