Catherine Marshall and Frank Shipman has interesting insight in Which Semantic Web? In it, they argue that the plethora of interpretations of the Semantic Web can be traced back to three different perspectives. Here they are:(1) A Universal Library - Readily accessed and used by humans in a variety of information use and contexts. This perspective arose as a reaction to the disorder of the Web, which was not ordered in categorization until search engines came along. Metadata, cataloguing, and schemas were seen as the answer.
(2) Computational Agents - Completing sophisticated activities on behalf of their human counterparts. Tim Berners-Lee envisioned an infrastructure for knowledge acquisition, representation, and utilization across diverse use contexts. This global knowledge base wil be used by personal agents to collect and reason about information, assisting people with tasks common to everyday life.
(3) Federated Data and Knowledge Base - In this vision, federated components are developed with some knowledge of another or at least with a shared anticipation of the type of applications that will use the data. In essence, this Web encompasses languages used for syntactically sharing data rather than having to write specialized converters for each pair of languages.
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