Morphological Rule Induction for Terminology Acquisition

We 1)res(;111; the identiti(:ation in corl)Ol"a of th:elM1 relatio11M adjectives (RAdj) such as gazc'uz (gaseous) which is derived from the noun gaz (.(/as). RAdj at)t)earillg in nonlinal phras('s are int('resting tbr ternlinology acquisition 1)ecause they 11ollt a llalning flnl(:tion. The (leriw> tio11M rules emt)loyed to (:omt)ute the nora1 front which has been deriv('(t the RAdj are a(xluired s('nli-mltonmti(:ally fronl n t~Gge(t and ~l lelnmatize(t (:orl)ora. q'hesc rules are then integr;ttell into ~t t('~rmer whi('h i(h',ntifies I{A(lj tlmnks to their 1)roi)el"ty of being paraphrasal)h; l)y a prepositionM phrase. RA(tj and comt)ound nouns which inchlde a I{A(tj m'e 1;111;11 (tuantifled, their linguistic precision is lneasured and their iutbrmative status is e.vahl;Lted thnnks to ~ thesaurus of the. dOUlMn. 1 I n t r o d u c t i o n litelM[ying relationM adje(:tives (l{.Adj) such a.s malarial, ~md 11Ol111 phrases in whirl1 they hi)pear su(:h as malarial mosq'uitoc.s, could be iuteresting in several tiehts (if NLP, such as ternlinology acquisition, tot)i(: detection, updating of thesauri, tm(:mlS(; they hold ~t 11~mlillg flln(:tiou acknowledged t)y linguists: (Levi, 1978), (M61isPudluhl , 1991), (;to. The us(', of RAdj is particularly ti'e(luent in scieutiti(: tields (Monceaux, 1993). P~m~(loxically~ ternlinology acquisition systems suc]l as TEI{MINO (David ~md Plant(': 11,)90), LEXTER (Bourigault, 1992), TERMS (.hlsteson and Katz, 1995), have not 1)een con(:erned with RAdj. Even (I1)ekwe-Sanjua, 1998) in her s tudy of tern1 wMatiOllS for idelltit)illg research tot)its fi'onl texts does 11ot; take into account derivatio1111 WMmltS. Our (:ou(:ern is: 1. 31) idelltit~y 1101111 phrases in wlli(:ll relational adje(:tives nt)l)ear, as well as the prel)ositiollM I)llrases l)y which they could 1)c t)ar;~l)llrase(t. We will see through anotll(;1" source 1)resented iu section 2 that this t)l"Ot)erl~y of parai)hrase (;tin be used to idellti(y these adjectives. 2. To check the naming character of these adje('tives and to evahlate the 11;ruling (:lmra(:ter of the, noun 1)hras(;s in which they ;11)l)em'. Moreover, i(hmtitlying both the a(tje(:tive ~ll(l the t)ret)ositional phrase is useflll ill th(; tMd of ternlinology a(:(luisition for t)eribrlning accurate tel'n1 llornlalization l)y grout)ing synonynL tbt'lnS referring to an uuique coneet)t such as p~vduit laitier (dairy prod'uct,) :re(l, pro&tit a'u lair (prod'uc/; 'with, milk), pTvd,uit de lair (p'~vd',,ct of milh), p~vd'uit issv, du lair (p~wd,uct, made o.f milk), (;t(:. 3]) (:m'ry out this i(tentitic;ttion, we use shallow t)m'Sillg (Almey, 1991), and then, tbr m()ri)hologi(:al processing, a dymmli(: nlethod wllMl t~lkes ~s input n (:orl)us ]M)eled with t)m't-ol "sl)eech and lellUUa l;;lgs. ~J)lle lnorl)hologicM rules m'e l)uilt selui-autonlaticMly ti'oln the (:orl)US. I]1 this stu(ty, we tirst defiue, and give some linguistic 1)roperties of RAdj. We then l)resent the method to build morphological rules mM how to integrate then into a ternl extractor. \¥e qUalltit~y the resullis ot)tailled fl'Oln a te(:hnical eorl)us in the tield of agriculture [AGII,IC] and evaluate their linguistic mid int'or111~tive precision. 2 L i n g u i s t i c p r o p e r t i e s o f r e l a t i o n a l a d j e c t i v e s Ac(:ording to linguistic and gralnlnaticM tradition, there are two nlain categories aUlOllg adjectives: el)ithetic slM1 as important (,sign'~ificant) and relatio11M adjectives such as laitier Malty). The tirst ones cannot ]l~ve an ~gentive interl)re-