Marcin Hanclik wrote:
What if the @type is derived from unverified metadata and the UA relies on the
underlying OS (assuming the file is local) ?
Does it mean that the UAs should always sniff to ensure that the @type is
correct?
Should we apply the procedure similar to the one from P&C that derives the
@type from the file name [4]?
[4]
http://dev.w3.org/2006/waf/widgets/Overview.html#rule-for-identifying-the-media-type-of-a
User agents can use a variety of different steps to determine the type
of a file. For instance:
https://developer.mozilla.org/En/How_Mozilla_determines_MIME_Types#ExternalHelperAppService
I am not sure it is necessary to specify a common approach here, but it
is useful to specify what happens when the user agent cannot determine
the type. I've made the following changes:
1. I agree that name consistency is desirable, so mediaType is now
simply type. I'll point out that <style>.type expects very few types
back, whereas for files, the picture is more complicated, so simply
calling it type has drawbacks, but since mediaType isn't used elsewhere
on the platform, I agreed that reusing the same name was desirable.
"mediaType
The ASCII-encoded string in lower case representing the media type of the file,
expressed as an RFC2046 MIME type [RFC2046]."
Although IANA registered types are all lower case, the subtypes are not (not
sure whether we want to mandate the toLower() normalization in the FileReader
API).
Therefore I suggest referring to IANA and RFC4288.
2. I've put in an editor's note to mention IANA and RFC4288. I'm not
sure *exactly* how useful subtypes are here, but it's worth making the
specification text more robust.
What if the @type is derived from unverified metadata and the UA relies on the
underlying OS (assuming the file is local) ?
Does it mean that the UAs should always sniff to ensure that the @type is
correct?
I think UAs *should* try to determine that the type is correct, but
don't think this is a *must*.
3. The empty string is returned if user agents cannot make a determination.
-- A*
