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CLDR-16939 document new unit prefix info #3591

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Apr 2, 2024
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CLDR-16939 document new unit prefix info #3591

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CLDR-16939 document new unit prefix info
macchiati Apr 2, 2024
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CLDR-16939 Minor formatting
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CLDR-16939 Typos
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CLDR-16939 Typos
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CLDR-16939 Merge commit 'edadfb07932269e141e3152ab5ecceb942abc52c' in…
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38 changes: 38 additions & 0 deletions docs/ldml/tr35-info.md
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Expand Up @@ -809,6 +809,44 @@ For example the following values can be suffixes in a simple_unit identifier suc
<unitIdComponent type="suffix" values="force imperial luminosity mass metric person radius scandinavian troy unit us"/>
````

### Unit Prefixes
```xml
<!ELEMENT unitPrefixes ( unitPrefix* ) >

<!ELEMENT unitPrefix EMPTY >
<!ATTLIST unitPrefix type NMTOKEN #REQUIRED >
<!ATTLIST unitPrefix symbol NMTOKEN #REQUIRED >
<!ATTLIST unitPrefix power10 NMTOKEN #IMPLIED >
<!ATTLIST unitPrefix power2 NMTOKEN #IMPLIED >
```

This data lists the SI prefixes that can be applied to units (typically limited to prefixable units),
such as the following:
```xml
<unitPrefixes>
<unitPrefix type='quecto' symbol='q' power10='-30'/>
...
<unitPrefix type='micro' symbol='μ' power10='-6'/>
...
<unitPrefix type='giga' symbol='G' power10='9'/>
...
<unitPrefix type='quetta' symbol='Q' power10='30'/>
<unitPrefix type='kibi' symbol='Ki' power2='10'/>
...
<unitPrefix type='yobi' symbol='Yi' power2='80'/>
</unitPrefixes>
```
The information includes the SI prefix and symbol, and the power of 10 or power of 2
(for binary prefixes, intended for use with digital units).

Note that the translated short form of a unit prefix is not the same as the localized symbol.
The localized symbol may be the same for most Latin-script languages,
but depending on the customary use in a language they can be in a different script
or use different letters even in Latin-script languages. They are, however, the same in the root locale.

The newer prefixes (quecto-, ronto-, -ronna, -quetta) are not yet being translated,
because the appropriate translated versions have not yet been well established across languages.

### Constants


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