Summary Object Interchange Format
<World-Wide Web, protocol> (SOIF) The attribute-value pair record format which Harvest Brokers use to exchange
Harvest content summaries.
SOIF provides a means of bracketing collections of summary objects, allowing Harvest Brokers to retrieve SOIF content summaries for many objects in a single, efficient compressed stream.
Harvest Brokers provide support for querying SOIF data using structured attribute-value queries and many other types of queries.
(http://www.ust.hk/Harvest/brokers/soifhelp.html).
