[ http://tools.oasis-open.org/issues/browse/OFFICE-3039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=20058#action_20058 ]
David Wheeler commented on OFFICE-3039:
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Regarding part 1 (the meaning of "pc"):
There's no ambiguity for "pc", but not for the reason Rob Weir gave above. Near the end of the CONVERT function there is a disambiguating rule: "In the case where there is a naming conflict (a unit name with a prefix is the same as an unprefixed name), the unprefixed name shall take precedence."
Since "pc"="parsec" is unprefixed, that interpretation takes precedence over the "pc"="pico-calorie" interpretation. We know of at least implementation (OpenOffice.org) that is using "pc" for "parsec", and since we usually prefer "what implementations actually do", that's a reason to prefer that implementation. I think that "picocalorie" is a rather unusual unit anyway; most people will use Joules at that point.
Note that the specification is specifically written so that implementations do *NOT* need to figure out if they're given Area, Volume, etc.; for a given string, there should be one and only one possible interpretation. Implementers have enough work to do without trying to figure out the unit system from context :-).
> Needs-Discussion: 6.16.18: Issues with Convert Function
> -------------------------------------------------------
>
> Key: OFFICE-3039
> URL: http://tools.oasis-open.org/issues/browse/OFFICE-3039
> Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
> Issue Type: Bug
> Components: OpenFormula
> Affects Versions: ODF 1.2 CD 05
> Reporter: Eric Patterson
> Assignee: David Wheeler
>
> 6.16.18
> "pc" ambiguity
> "c" is the prefix for energy unit calorie and can accept the pico prefix "p" hence "pc" is pico-calorie. The spec also defines "pc" as an abreviation for parsec. Proposal: Remove "pc" as symbol for parsec.
> HPh Source?
> Is Horsepower-hour (HPh preferred)a standard unit? What is the source?
> kibit binary Prefix
> All of the Binary Unit Prefixes are inital caps, should "ki" be "Ki"?
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