Federated search

 

Federated search technology enables users to search multiple information resources simultaneously through one search query. Users can then view search results in a single integrated list. In other words, users do no longer need to consult each information resource individually. Instead, they can search multiple library catalogs (OPACs), Web sites (e.g. Amazon.com, Google etc.), subscription and citation databases all at once.

Federated search technology is an integral component of an Information Portal, which provides the interface to diverse information resources. Once the user enters his or her search query in the search box of the Information Portal, the system uses federated search technology to send the search string to each resource that is incorporated into the Portal. The individual information resources then send the Information Portal a list of results from the search query. Users can view the number of documents retrieved in each resource and link directly to each search result.

In short, an Information Portal uses federated search technology to enable users to:

• Search for information in multiple information resources through a single query.
• View search results in a single list.
• Link directly to each resource to expand the search.

federated search for agricultural resources:

http://search.nal.usda.gov/nalsearch/