The metadata browser shows only the Salesforce objects on which users can perform query operations.
元数据浏览器只显示用户可以对其执行查询操作的Salesforce对象。
The upcoming section demonstrates how to perform query operations on this XML data using our Team Room application.
后面一节演示如何使用Team Room应用程序对这个XML数据执行查询操作。
Secondly, it removes the need for error-prone type casts. (a problem more common with query operations than CRUDs.)
其次，它消除了易出错的类型强制转换的需要(这是一个在查询操作中比在CRUD中更常见的问题)。
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