"Circo lets users search for any qualities they’re interested in. The engine then grades and ranks the results by each quality on an “A” through “F” scale based on how well the description fits for reviewers. For example, a hotel reviewers feel is spacious would rate highly if searching for openness, but poorly if you’re looking for a tiny room...
Circos is categorized under the ever expanding umbrella of semantic search engines, which currently includes the likes of Hakia, PowerSet, Kosmix, SemantiNet, Quintura, and TrueKnowledge. However, the engine is most like Kango, which has also taken on the task of categorizing hotels based on user reviews. VibeAgent also has a search engine for its own site that will search hotels based on qualities."
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