Documenting the Lule Sámi twol rules file
The file itself is located in gt/src/smj/twol.txt. The file is modeled upon the corresponding file for North Sámi, but has been revised and differs from it on several issues. The grammatical sources are Spiik 1989: Lulesamisk grammatik and Nystø and Johnsen 2001: Sámásta 2.
The rule file has the sections Alphabet, Sets and Rules. The rules are ordered thematically, with 3 main sections: Consonant alternations (except cg), vowel alternations, and consonant gradation.
The Alphabet section
The members of the Alphabet set
All Lule Saami letters are listed. The Lule Sámi ENG sound is represented as ñ. Lule Sámi letter repertoire is not fully standardised. In the source code we write (and you shall write!) æ; ø; ñ, but the parser toleratesinput written with the the letters ä; ö; ń, ŋ (cf. the 4 rules in the file gt/smj/src/spellrelax.regex).
The 3rd degree mark ' is never realized, hence declared as ':0.
h2, g2 etc. are consonants deleted in the Nom. m3, d3 etc. (?) are consonants that undergo certain processes word-finally. This issue should be looked into. Perhaps the two sets can be unified. The reason why there are more distinctions than for sme, is that the cns deletion process is more phonological in sme.
The Dummy symbols
The Dummy symbols are taken from the sme file for convenience, only a small part of them are actually used, they are defined in the Sets section along the way, included there as soon as they are used. The set of actually used Dummy symbols is thus the set declared in "Dummy".
X shall be used for nouns only, Y for verbs only and Q for processes common to both. The symbols themselves are used in the following way:
X1 = Deletes final h3 in short essive of uneven syllables X2 = WeG and neutralization of g2 etc. (hivsik) X3 = Weg and deletion of g2 etc. (bena) X4 = e:á and e:å in illatives X5 = e:á, e:å and o:u in odd-syllable nouns X6 = Deviant III-I consonant gradation (in contracted stems, guobbmu:guomoj X7 = WeG and e>á, o>á in front of diminutives X8 = Px declension X9 = Stem-vowel and central consonant shortening in first part(s) of compounds ... Y1 = Stem vowel deletion, imp 3sg, 3du, 2pl, 3pl of verbs Y2 = "Indicative Present Singular 3rd Final Vowel in verbs" Y3 = PrsPrc Y4 = e > u in front of dersuff, o > u and e > á in front of dersuffix -alla Y5 = e > a, i > á, o > u, e > å in verb derivation Y6 = "Consonant insertion as II-III strengthening gradation" Y7 = "Consonant insertion as II-III strengthening gradation" Y8 = "Stem vowel deletion in even-syllable verbs, imp 1du, 1pl" Y9 = "Stem vowel deletion in short passives of even-syllable verbs and Consonant insertion as II-III strengthening gradation" ... Q1 = The general weak grade trigger. Stem vowel change e:i and o:u in fron of j. Dipht. simpl. Any environment #only# demanding WeG shall use Q1. Q2 = Vowel harmony: 2nd syll e realized as å whenever 1st syll is å. Q3 = WeG in contracted, also does not trigger Dipht simpl. Q4 = Stem vowel change e:i and o:u in fron of j. Dipht. simpl. Like Q1 but strong grade. Q5 = e:á stem vowel change for word diehtet. Weak grade. Q6 = e:á stem wovel change for word diehtet. Strong grade. Q7 = e:á stem vowel change for word diehtte. Extra strong grade Q8 = Stem vowel deletion, impII of verbs.
The Sets section
These are the sets:
- Vow = the vowels
- Cns = the consonants
- DelCns = the consonants that are deleted in nominative
- WeG = the dummy symbols that trigger weak grade
- StemCns = consonants that may occur in stem-final position
- Dummy = the set of dummy symbols, they are there to trigger certain morphophonological symbols
The rules section has the following chapters:
! Consonant alternations in certain pos ! Vowel lengthening ! Stem vowel alternations ! Diphthong simplification ! Consonant gradation rules
Consonant alternations in certain pos
All rules deal with word-final position.
This is the gussa : gusá case, where the 2nd syll vowel a is lengthened to á whenever the consonant is shortened to grade I.
Stem vowel alternations
This section is divided according to stem vowels: a-, e-, o- stems.
There are no rules for a-stems.
For e-stems, there is e:i, e:á, e:å, e:u and e:a. Each alternation is triggered by a combination of phonological content and dummy symbols.
For o-stems there is o:u.
The diphthong simplification handles oa:å and æ:e. Phonologically, these are identical processes, but since the dip thong is written by two letters in the former case and by one letter in the latter, the alternations must be handled separately. The section also handles ie:æ, these are in principle the same as oa:å, but the alternation does not occur in so many contexts.
The oa:å simplification has a two-art rule, one for o deletion, and one for a:å change. Otherwise, the rules are identical (this is the type where xfst would have been better than twolc).
Consonant gradation rules
The consonant gradation rules differ considerably from the corresponding rules for North Sámi. Instead of generalizing over sets of consonants (Cx:Cy <=> ...), each rule contains the alternation for one consonant only, and to the right of the <=> arrow is listed all the contexts where the relevant alternation appears. The disadvantage with this method is that the same context must be written several times, if e.g. both p, t and k are deleted in the same contexts, each of these contexts must be written several times, one for each consonant. The advantage is that there are no conflicts during compilation, compilation takes 10 seconds rather than 3 minutes. The earlier North-Sámi-style rule set was ordered according to CG pattern. This pattern is still visible in the new rules, via the reference S1-3 etc. (Spiik's Series 1, 3-letter pattern, etc) behind each subrule.
This actually opens up for a migration to an xfst rule file instead of the current twolc format, since what xfst really cannot do is generalize over sets (Cx:Cy etc.). This is an issue for future revisions to decide.
The rules are divided in two subsections, deletion rules and change (alternation) rules.
The b, d, g deletion rules are similar, via the optional ( b ) etc. in front of the "_" symbol, both bm:m and bbm:bm alternations are covered. The contexts differ to a certain extent. For b and d, the III-I special gradation bbm:m is covered by two separate rules, and a special Dummy (X6), not part of the ordinary WeG set.
Note that one of the rules for t:0 refers to #: as part of its context. As soon as clitics are added to the word form, this rule will thus not be triggered. Look into this when the clitics are added.
The Cx:Cy format was kept for hk:g, hp:b, ht:d, since the left context h:0 was unique, and no compilation conflict thus arose.
The bb:pp, gg:kk, dd:tt alternations were split into three rules, since keeping them in one Cx:Cy rule created compilation conflicts. Also, d:t contain a rule not found for the other two...
Debugging of twol-rules
All rule conflicts have been successfully resolved. The rule file should be kept that way. Look out for conflicts in the compilation process, and resolve them as they appear!
Last modified $Date: 2015-04-12 05:50:56 +0200 (sotn, 12 cuoŋ 2015) $, by $Author: trond $