尽管DB 2 PE的历史数据只保留较短的时间(几小时或几天)，但是一旦数据被保存在PWH中，这些数据便可在很长的时间内用于报告和趋势分析。
While the history data of DB2 PE is only retained for a short time (hours or days), once data is in the PWH, the data is available for reporting and trend analysis over much longer periods.
标准的atom： title和atom： content元素被保留用于不支持Activity Streams订阅源的解析器。
The standard atom: title and atom: content elements have been retained for use with parsers that do not support Activity Streams feeds.
不可信的数据被保留下来用于在浏览器中可视查看，如 图 5 所示。
The untrusted data is preserved for visual appearance in the browser as shown in Figure 5.
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