About libferris: witme.sourceforge.net/libferris.web [1]
Extended Attributes Table: witme.sourceforge.net/libferris.web/research/eadescriptions.html [2]
Xapian::QueryParser Syntax: www.xapian.org/docs/queryparser.html [3]
libferris FAQs: witme.sourceforge.net/libferris.web/research/faq.html#relativetime [4], witme.sourceforge.net/libferris.web/research/faq.html#pgplsqltsearch2 [5] and witme.sourceforge.net/libferris.web/research/faq.html#agents [6]
Links:
[1] http://witme.sourceforge.net/libferris.web
[2] http://witme.sourceforge.net/libferris.web/research/eadescriptions.html
[3] http://www.xapian.org/docs/queryparser.html
[4] http://witme.sourceforge.net/libferris.web/research/faq.html#relativetime
[5] http://witme.sourceforge.net/libferris.web/research/faq.html#pgplsqltsearch2
[6] http://witme.sourceforge.net/libferris.web/research/faq.html#agents