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Subject: [OASIS Issue Tracker] Commented: (OFFICE-2345) 3.6 Error: Definingerror?

    [ http://tools.oasis-open.org/issues/browse/OFFICE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17575#action_17575 ] 

Andreas Guelzow  commented on OFFICE-2345:

I think we have to define that there is a class of values that are called error values. Otherwise we can never say that a function returns an error or define ISERROR or formalize what happens if a normal function receives an error as argument.

We also need to define at least one error, namely #N/A since otherwise there is no way of defining the functions ISNA or NA.

Beyond that I see no real reason why we need to mention any other specific errors. 

I agree that there is a problem with having a recommended list of errors (not required) and later refer to the error #NULL when defining operators since that error value need to exist.

> 3.6 Error: Defining error?
> --------------------------
>                 Key: OFFICE-2345
>                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-2345
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Bug
>            Reporter: Patrick Durusau
> The first paragraph of 3.6 Error reads:
> "An error is one of a set of possible error values. Implementations may have many different error values, but one error value in particular is distinct: #N/A, the result of the NA() function. Users may choose to enter some data values as #N/A, so that this error value propagates to any other formula that uses it, and may test for this using the function ISNA()."
> Err, do we mean to define the error #N/A and that it propagates? 
> The reason I ask is that here we start off saying that an error is a set of possible error values but don't say what that set is. Moreover it comes up in the next paragraph one or more error results that show up in a result. 
> I saw the note about "maximum flexibility" but how would an evaluator know when it saw an error if we don't define it? Or do we want to say that errors, other than #N/A are implementation defined? 
> Are there any cases where functions or operators don't return an error value as a result when the error is an input value? 

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