[foaf-dev] foaf phone and tel URLs
henry.story at bblfish.net
Wed Jan 30 19:57:13 GMT 2008
On 30 Jan 2008, at 19:35, Peter Williams wrote:
> Although many URI schemes are named after protocols, this does not
> imply that use of these URIs will result in access to the resource
> via the named protocol. URIs are often used simply for the sake of
> identification. Even when a URI is used to retrieve a representation
> of a resource, that access might be through gateways, proxies,
> caches, and name resolution services that are independent of the
> protocol associated with the scheme name. The resolution of some
> URIs may require the use of more than one protocol (e.g., both DNS
> and HTTP are typically used to access an "http" URI's origin server
> when a representation isn't found in a local cache).
> That a resolvable tel: is dependent on a SS7 nameserver or an ENUM
> nameservice (and then their feature/sub-service naming/addressing
> properties) seems consistent with W3C doctrine, no?
Put that way it makes more sense.
Still, this tel URI is pretty complex.
This is what got me worried:
This URL places a voice call to the given number. The number format
is intended for local use: the first zero opens an outside line, the
"w" character waits for a second dial tone, and the number already has
the international access code appended to it ("00"). This kind of
phone number MUST NOT be used in an environment where all users of
this URL might not be able to successfully dial out by using this
number directly. However, this might be appropriate for pages in a
company intranet. The <area-specifier> which is present hints that the
number is usable only in an environment where the local entity's phone
number starts with the given string (perhaps singling out a company-
wide block of telephone numbers).
The URL describes a phone number which, even if it is written in its
international form, is only usable within the numbering area where
phone numbers start with +1234. There is also a proprietary extension
"vnd.company.option", which has the value "foo". The meaning of this
extension is application-specific. Note that the order of these
parameters (phone-context and vnd.company.option) is irrelevant.
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