The proliferation of information providers has led to an increased number of users browsing the World Wide Web. 'lime-consuming interaction and increased network loads are some of the adverse effects of browsing activities. This paper presents a design based on agent technology and the use of structured information, that significantly lowers network load and hits user-interaction by automating the task of browsing. combines the use of Knowledge Query and Manipulation Language (KQML)[14] and Java[3] to design a scalable model for agent communication. KQML is a protocol for information exchange among agents. Java is an objectoriented, interpretive language specifically developed for heterogeneous, platform-independent, distributed network computing.Our design enables us to pass object-oriented Java code in declarative KQML messages.It is our belief that building a model based on these ideas, should significantly lower network load and limit user-interaction by automating the task of browsing and composing information. It is our hypothesis that agent technology significantly reduces the complexity of browsing wide-area information by reducing communication and filtering overhead as well as by distributing the workload. In a simplistic view, an agent accepts specifications for the desired information, interacts with relevant information providers, and composes information from various information sources to fit the user's specification. Our goal is to make the infrastructure as general as possible in order to accommodate a wide range of information content and agent-based tmmactions.Specifically, our work addresses the issues of automating the task of browsing by executing content filtering and evaluation at remote sites. In addition, we believe that wellstntctured information content eases the task of automated browsing by agents.We demonstrate this by using the Nebula File System[8] for storage and retrieval of content via agents. The Nebula F1le System is a prototype wide-area information system, that offers a model for organizing and storing structured information.Section 2 describes the problems and issues regarding 296 browsing. In section 3 we present the idea of an agent and discuss some of the design issues involved. We also present the agent primitives in particular, content primitives, communication primitives and movement primitives for mobile agents. Section 4 demonstrates a small example.Section 5 discusses background and related work.
The paper describes the design of Nebula. Nebula is a dynamic, object based typed file system. Nebula uses types to create well structured files as well as to export existing files in the internet environment. This allows for backward scalability. Files in Nebula are abslractions and are defined by objects. Nebula assumes a flat global namespace and operations are provided to manipulate logical namespaces.
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