Consider the following two conceptions of the Semantic Web:
– A web of (logic based) knowledge representations.
– A web of (semi-)structured data.
In both conceptions, the common factor (the web) imposes certain requirements: extremely variable scalability (from a home page to community sites to sites that encompass a significant fraction of the web), rapid evolution, radical distribution, arbitrary interconnection and aggregation, and very little validation or other means of control. The demands of the web are forcing both the knowledge representation (KR) and the database communities to stretch their understanding and technology in different ways.