图3显示了一个应用程序所需要的查询表的高级视图，以及如何关联 BPEDB 数据库中的物理表或视图。

Figure 3 shows a high level view of the query tables needed for this application and how they relate to the physical tables or views in the BPEDB database.

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物理服务器或目录ddl与视图。

Physical server or catalog DDL and views.

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这些服务对象可以是业务实体视图(如ShoppingCart或PrintJob)，或是物理资源的软件facade(如Printer)。

These service objects may be a view of a business entity, such as ShoppingCart or PrintJob, or be a software facade for a physical resource, such as Printer.

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这些服务对象可以是业务实体视图(如ShoppingCart或PrintJob)，或是物理资源的软件facade(如Printer)。

These service objects may be a view of a business entity, such as ShoppingCart or PrintJob, or be a software facade for a physical resource, such as Printer.

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