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I'm wondering if anyone can point me to a decent reference on the use of specific unicode characters. I'm specifically interested in the Spacing Modifier Letters block. The descriptions given in the unicode code charts don't actually provide examples of use and this is causing some problems for me.
The actual code chart lists the subrange 0x02D8–0x02DD as 'Spacing Clones of Diacritics', but there are a variety of other characters in this block which are also simple spacing clones (e.g. 0x02C6 'modifier letter circumflex accent') and some which might appear to correspond to a combining mark but which are also used as spacing marks. For example, 0x02CC 'modifier letter low vertical line' can't really be viewed as a simply a spacing clone of 0x0329 'combining vertical line below' since the spacing form represents a stress mark whereas the combining form is used to indicate syllabicity in the IPA or as a vowel modifier in, e.g., Yoruba.
Unfortunately, there are many characters in this range which I am unsure of. For example, I don't know if the half-rings (0x02BE-0x02BF) are used as independent forms with usages similar to apostrophes, or if these are simply spacing versions of the corresponding combining forms. In the former cases, I'd assume the spacing versions should be lower and more prominent, but I can't find info on these and many other characters in this block.
Any suggestions would be appreciated.