For some queries, the wanted result cannot be retrieved with a single LDAP query.
对于某些查询，无法使用单个ldap查询来检索所需的结果。
The benefit provided by asynchrony is that by the time the rows from SHIP1 have been received, the result set of SHIP2 is hopefully ready and waiting to be retrieved from the remote source.
异步所带来的优点在于，当接收完 SHIP1 的结果时，很可能 SHIP2 的结果集就已经准备好了，随时可以从远程数据源检索到联邦服务器。
These result sets are not BIRT data sets, but contain the bound columns from the data container, which are usually retrieved from a data set.
这些结果集并不是BIRT的数据集，但却包含了数据容器中绑定的列，而该数据容器中的数据则来自于一个数据集。
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