对于聚合Feed，有几点重要的地方需要注意。
There are several important things to note about Aggregate feeds.
没有太多的人会注意搜索索引和新闻聚合器中的缺陷，或者因此而烦恼，但是当涉及到他们在拍卖中支付的钱时，大多数人会立即注意到错误。
Not too many people will notice or be upset by a flaw in a search index or a news aggregator, but most people will immediately notice an error when it comes to money they had bid with in an auction.
您可以注意到，命令规范上有许多微小的差异和变化，但是各种技术最终聚合在相同的核心概念上。
You'll note numerous small differences and slight variations in the naming conventions, but the approaches have converged on the same core concepts.
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