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The Third Update to eg2X — eg2C

Read Document 2X and Homework 2C. Files in use: Grammar 2C Dictionary 2C Parse directive 2C Sentences 2C The grammar eg2C is concerned primarily with the expansion of <LN>, with the inclusion of time strings (<NSTGT>) and subordinate clauses (<SUB1>), and with the restriction of adverbs to particular slots. Also <LNR> is revised to include <NVAR> instead of <*N> so that both nouns and pronouns can be grouped together instead of having <LPROR> as an option of <NSTG>. <LN> is expanded to include quantity modifiers (<QPOS>) and noun modifiers (<NPOS>), as in few stone towers. <APOS> is made recursive to allow for more than one adjective (few old green stone towers. <QPOS> now calls on an LXR type definition (<LQR>), as does <APOS> (<LAR>). <LAR> includes <*ADJ> (a green stone), <*VEN> (a broken stone), and <*VING> (a growing investigation). Both <*Q> and <*ADJ> may have an adverb as a left-adjunct, so <LQ> contains <*D> (very few), and <LA> contains <*D> (very old). A new agreement restriction WAGREE-LN checks that a SINGULAR (or PLURAL) left adjunct of N agrees with a SINGULAR (or PLURAL) core oF <NVAR> (ruling out a towers). Three new options appear in <SA>. These are <TOVO> (e.g. To find the buttons in To find the buttons, they had to dig). Noun strings of time <NSTGT> (years ago), and a subordinate clause <SUB1> (while they dug). The restriction WTIME checks that the noun in <NSTGT> has the attribute NTIME1. Subordinate clauses are introduced by words such as while and before in the category CS1. In eg2C, adverbs may appear in nine possible positions - SA, LT, LQ, LA, RN, LW, RW, LV, RV. Since there are certain subclasses of adverbs that cannot appear freely in all slots, this means that without restrictions a problem can arise with the placement of adverbs. An example was seen in the unintended parse of The found out the facts, where out was parsed as an adverb in <RV> (like They walked out) instead of the initial <*DP> of the object string <DP2> of found. The solution lies in restrictions which allow only adverbs with the correct attribute to fill a given adverb slot. Few changes are needed in the dictionary. The attributes NTIME1, DLA, DLQ, DLT, DLV, DRN, DRV and DSA are added to the ATTRIBUTE list in eg2C and to the appropriate words. CHANGES MADE IN THE GRAMMAR *BNF SA add NSTGT, TOVO, CSSTG NSTGT new SUB1 new NSTG delete LPROR, add PLACESTG LNR replace *N with *NVAR NVAR new LN add QPOS, NPOS TPOS make LTR LTR new LT new RT new QPOS make LQR LQR new LQ new RQ new APOS make recursive (LAR), add *VING LA new AVAR new RA new NPOS new RN add D LPROR delete OBJBE change *ADJ to ASTG ASTG new *LISTS ATTRIBUTE add DLA, DLQ, DLT, DRN, DRV, DSA, NTIME1 STRING add SUB1, NSTGT, PLACESTG ADJSET add LA, LQ, LT, RA, RQ, RT; delete LPRO LADJSET add LA, LQ, LT; delete LPRO RADJSET add RA, RQ, RT LXR add LQR, LAR; delete LPROR *RESTR WAGREE-LN new WPOSLA new WPOSLQ new WPOSLT new WPOSRN new WPOSRV new WPOSSA new WTIME new CHANGES MADE IN THE DICTIONARY A define as T:(SINGULAR) AGO add DRN AROUND define as D: (DRV), P: ('AROUND') BEFORE add CS1 BY add DRV A_FEW add Q:(PLURAL) FEW add Q:(PLURAL) FINALLY add DSA IN add DRV MANY add Q:(PLURAL) NEWPORT_,_RHODE_ISLAND new OUT add DRV QUITE_A_FEW define as Q:(PLURAL) QUITE_A_WHILE define as D: (DSA) UNDER add DRV UP add DRV VERY add DLA WHILE add NTIME1, CS1 YEARS add NTIME1