Manipulation of trees in information retrieval

Abstract

Introduction All inf~n'm:t{i~)l,., ret, ri('val system is (tesigned t() provide "tli:-tvo!'s It) l'('(llIOSld, I'()F iilf()l'lllaiiotl. Ill s()nle S VS{OInS~ l'('ful'('!i('c:< ill thc f4)l'lll O[ d<)cimlelit or ill)ok titles al'o (il)/a[]i(:ri l'al}i('l" lhali sf)e('ific ilenis ()f inforiliatioll; tiles() io['e!'cile(,s. {l/ iurn, l(,~.t t,> (he act !lal r('(lttired inforiltatioii. If a-'.ttolli~tlic nu'lho([> ave i() }~e used for tit(' per[ornlance of iP.f()l'ltlatj()li l('tri('val o[)(,l't/iiOliS, pl'ot'ed/ll'es Ilittst be