Difference between revisions of "Ideas for Google Summer of Code/Flag diacritics in lttoolbox"
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</sdefs> |
</sdefs> |
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<cdefs> |
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− | < |
+ | <cdef n="ge_0" c="ge- prefix not present"/> |
− | + | <cdef n="ge_1" c="ge- prefix present"/> |
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− | <c-value n="1" c="ge- prefix present"/> |
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− | </def-constraint> |
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</cdefs> |
</cdefs> |
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<pardefs> |
<pardefs> |
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<pardef n="ge__prefix"> |
<pardef n="ge__prefix"> |
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− | <e><p><l></l><r/></r></p><c n=" |
+ | <e><p><l></l><r/></r></p><c n="ge_0"/></e> |
− | <e><p><l>ge</l><r/></r></p><c n=" |
+ | <e><p><l>ge</l><r/></r></p><c n="ge_1"</e> |
</pardef> |
</pardef> |
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<pardef n="breek__vblex"> |
<pardef n="breek__vblex"> |
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− | <e><p><l/><r><s n="verb"/><s n="pres"/></r></p><c n=" |
+ | <e><p><l/><r><s n="verb"/><s n="pres"/></r></p><c n="ge_0"/></e> |
− | <e><p><l/><r><s n="verb"/><s n="past"/></r></p><c n=" |
+ | <e><p><l/><r><s n="verb"/><s n="past"/></r></p><c n="ge_1"/></e> |
</pardef> |
</pardef> |
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</pardefs> |
</pardefs> |
Revision as of 21:56, 17 March 2010
Flag diacritics are a method used in the HFST tools to allow the writer of a transducer to exclude impossible analyses at run-time, where removing them from the transducer would explode its size.
This would allow us to nicely handle languages with prefix inflection, or with circumfix inflection
<dictionary> <alphabet/> <sdefs> <sdef n="verb"/> <sdef n="pres"/> <sdef n="past"/> </sdefs> <cdefs> <cdef n="ge_0" c="ge- prefix not present"/> <cdef n="ge_1" c="ge- prefix present"/> </cdefs> <pardefs> <pardef n="ge__prefix"> <e><p><l></l><r/></r></p><c n="ge_0"/></e> <e><p><l>ge</l><r/></r></p><c n="ge_1"</e> </pardef> <pardef n="breek__vblex"> <e><p><l/><r><s n="verb"/><s n="pres"/></r></p><c n="ge_0"/></e> <e><p><l/><r><s n="verb"/><s n="past"/></r></p><c n="ge_1"/></e> </pardef> </pardefs> <section id="main" type="standard"> <e lm="breek"><par n="ge__prefix"/><i>breek</i><par n="breek__vblex"/></e> </section> </dictionary>
Normal lt-expand
output of this would look like:
breek:breek<verb><pres> breek:breek<verb><past> gebreek:breek<verb><pres> gebreek:breek<verb><past>
But with flag diacritics it would look like:
breek:breek<verb><pres> gebreek:breek<verb><past>
See also
Further reading
- Karttunen and Beesley (2002) "Finite State Morphology" (CLSI) ch. 8 "Flag diacritics"