Re: [ws-dd] Issue 039 - DPWS - Recursive hosting

[Antoine Mensch <antoine.mensch@odonata.fr>]

Additional info:
Impact: implementation change
Urgency: Medium
Priority: High


Ram Jeyaraman a écrit :
> This issue is assigned the number 039. For further discussions on this issue, please refer to this issue number or use this thread.
>
> -----Original Message-----
> From: Antoine Mensch [mailto:antoine.mensch@odonata.fr]
> Sent: Tuesday, September 16, 2008 4:19 PM
> To: Ram Jeyaraman
> Subject: NEW Issue - Recursive hosting
>
> Please defer discussions on this issue until a time this issue is
> accepted and is assigned a number.
>
> Document: DPWS
> Location (defaults to line number): 541
> Owner: Antoine Mensch
>
> Description:
> It is not clear whether the specification allows recursive hosting of
> services: the wording seems to allow it, as Hosts are described in terms
> of services and not devices. On the other hand, two aspects of the
> specification tend to indicate a single level of hosting: (i) the main
> purpose of hosting is to let the host (device) advertise itself and its
> hosted services through a single discovery message, thus avoiding
> multiple multicast messages. As hosted services are not supposed to be
> part of the discovery infrastructure (they will not advertise
> themselves), it does not seem very useful to let them have hosted
> services themselves. (ii) the rules for implied values for missing Host
> or Hosted elements do not work well in case of multiple levels of
> hosting: assume D is a device, A a hosted service hosted by D, and B a
> hosted service hosted by A. What should be the values (both explicit and
> implied) of Host and Hosted in the response to a Get sent to A?
>
> Proposed resolution:
> This point needs clarification. There does not seem to be clear
> requirements for recursive hosting (except perhaps moving UPnP models to
> DPWS)
>
>
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