Constructing a system using time dependent multimedia document

A time-dependent multimedia document (TDMD) system is being developed. A method for formally specifying the structure of time-dependent documents is proposed. A time-dependent document consists of temporal information, spatial information and content information. The proposed structure can include various types of objects which can specify those three types of information. It is shown that a tree structure is suitable for representing a TDMD system. By using the proposed structure, intelligent processing such as retrieving of content information by name, by time, and by location, independent editing of content information, location editing, and time editing can be realized. To interchange a document between computers, the structure of the document is described by ASN.1. A prototype system was implemented in which a time-dependent document can be interchanged between SUN workstations.<>