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search aggregator
A search aggregator is a type of metasearch engine which gathers results from multiple search engines simultaneously, typically through RSS search results. It combines user specified search feeds (parameterized RSS feeds which return search results) to give the user the same level of control over content as a general aggregator.
Soon after the introduction of RSS, sites began publicising their search results in parameterized RSS feeds. Search aggregators are an increasingly popular way to take advantage of the power of multiple search engines with a flexibility not seen in traditional metasearch engines. To the end user, a search aggregator may appear to be just a customizable search engine and the use of RSS may be completely hidden. However, the presence of RSS is directly responsible for the existence of search aggregators and a critical component in the behind-the-scenes technology.
==History==
The concept of search aggregation is a relatively recent phenomenon with the first ones becoming available in 2006. In 2005 Amazon published the OpenSearch specification for making search results available in a generic XML format. While many sites currently publish results in OpenSearch, many simply publish in generic RSS format. However, while OpenSearch syndication allows for greater flexibility in the way Search Aggregators display results, it is generally not required.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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