| 摘要 |
A building automation system (BAS). In one embodiment, the BAS comprises a database and a relational directory. The database is adapted to store data definitions. The relational directory includes data definitions for the BAS, stored in the database, and includes a site level, a system level, a device level, and an extension level organized in a hierarchical relationship in the database. In another embodiment, the BAS comprises a database, a relational directory of data definitions for the BAS, and a server engine.
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