USE OF MODIFYING LETTER [STRESS MARKER] IN BORO, MAITHILI,DOGRI

[raydoc]

Boro, Maithili and Dogri are mild tonal languages and admit a stress marker .
"The orthographies of the Bodo, Dogri, and Maithili languages
of India make use of U+02BC “ ’ ” modifier letter apostrophe, either as a tone mark or
as a length mark. In Bodo and Dogri, this character functions as a tone mark, called gojau
kamaa in Bodo and sur chinha in Dogri. In Dogri, the tone mark occurs after short vowels,
including inherent vowels, and indicates a high-falling tone. After Dogri long vowels, a
high-falling tone is written instead using U+0939 devanagari letter ha.
In Maithili, U+02BC “ ’ ” modifier letter apostrophe is used to indicate the prolongation
of a short a and to indicate the truncation of words. This sign is called bikari kaamaa."
PROVENANCE: UNICODE CHAPTER 12. pp. 484-485