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On 23/08/2022 00:31 Sławomir Osipiuk via Unicode <<a href="mailto:unicode@corp.unicode.org">unicode@corp.unicode.org</a>> wrote:
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Why is Vertical_Orientation even listed in 4.2.9.1 if it doesn't need
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special handling? How is it even a "complex" case in any meaningful way?
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The default is "R". The "U" ranges are all explicitly listed, making them
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*non-default* from a parsing standpoint, all handled by normally reading
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the data file. Is this not correct?
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The Unicode term “default property value” has only a limited connection with the natural English meaning of the phrase. A “default property value” of an encoded character property is one taken by unassigned code points or encoded characters for which the property is irrelevant (TUS Section 3.5 D26). Its connection with parsing is currently weak and confusing when there are multiple “default property values”.
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Worse, only an encoded character can have an “explicit property value” (D24)!
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Richard.
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