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Re: Clarification on exceptions

From: Marcos Caceres <marcosc@opera.com>
Date: Mon, 27 Sep 2010 13:41:13 +0200
Message-ID: <4CA082D9.1000606@opera.com>
To: Doug Turner <dougt@dougt.org>
CC: public-geolocation <public-geolocation@w3.org>

On 9/27/10 7:59 AM, Doug Turner wrote:
> It is clearly under-specified.
> Do you think that there is an expectation that the exceptions need to
> match for browser interop?

Because current implementations are all throwing an exception, then in 
terms of interop, the risks of changing the spec are minimal (look at 
this as a clarification). It only gets tricky if the developer wants to 
check why the exception was thrown - in which case, yes, there are 
(minor) interop issues as demonstrated by my last email.

So, at the very least, the spec should say that an exception is thrown. 
The only way to understand that this is what is intended by the spec is 
to turn to the test suite: the test suite is acting as the normative 
text for the spec - which is bad. If an exception is thrown, then the 
type of exception should be specified. Other specs clearly define what 
the exception to be thrown should be in given situations (see any of the 
"HTML5" related specs).

We have a strict QA system that requires us to specify not only that an 
exception is thrown, but also check that the right kind of exception is 
thrown. That is the reason I raised this.

Kind regards,

Marcos Caceres
Opera Software
Received on Monday, 27 September 2010 11:41:52 UTC

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