數字地球的關鍵技術-語義網和OWL簡介(ppt 26頁)

1. 語義網簡介
2. OWL簡介
3. 實例演示（Protégé OWL ）
4. 小結

語義網（Semantic Web）：
1. Tim Berners-Lee 推動的互聯網2.0版
2. 全麵應用元數據技術（標識所有的東西）
3. 而且是機器可以理解的“元數據”
4. 本體技術是實現語義網的核心
5. 注意：不要和語義網絡（Semantic Network）混淆
Tim Berners-Lee講故事：
The entertainment system was belting out the Beatles' "We Can Work It Out" when the phone rang. When Pete answered, his phone turned the sound down by sending a message to all the other local devices that had a volume control. His sister, Lucy, was on the line from the doctor's office: "Mom needs to see a specialist and then has to have a series of physical therapy sessions. Biweekly or something. I'm going to have my agent set up the appointments." Pete immediately agreed to share the chauffeuring.
At the doctor's office, Lucy instructed her Semantic Web agent through her handheld Web browser. The agent promptly retrieved information about Mom's prescribed treatment from the doctor's agent, looked up several lists of providers, and checked for the ones in-plan for Mom's insurance within a 20-mile radius of her home and with a rating of excellent or very good on trusted rating services. It then began trying to find a match between available appointment times (supplied by the agents of individual providers through their Web sites) and Pete's and Lucy's busy schedules.
（The emphasized keywords indicate terms whose semantics, or meaning, were defined for the agent through the Semantic Web.）
In a few minutes the agent presented them with a plan. Pete didn't like it—University Hospital was all the way across town from Mom's place, and he'd be driving back in the middle of rush hour. He set his own agent to redo the search with stricter preferences about location and time. Lucy's agent, having complete trust in Pete's agent in the context of the present task, automatically assisted by supplying access certificates and shortcuts to the data it had already sorted through.

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