... keyword-based^(*)

We use the term keyword-based to refer to algorithms that do not use any linkage information, and the term link-based for algorithms that use both keywords and links in their ranking schemes.

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... queries^(**)

Each query also has much longer versions which some TREC participants use in their systems.

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... site⁽⁺⁾

We loosely use the term site to refer to the root page of a group of pages on (usually) the same host. Of course this definition is not always true.

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... log⁽⁺⁺⁾

Made available by Jack Xu of Excite via $ftp.excite.com/pub/jack/Excite\_Log\_12201999.gz$

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... shield''^(#)

This is the New Jersey arm of Blue Cross Blue Shield, a big American health insurance company.

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