Issue 070 - DPWS - Content negotiation for PresentationUrl

This issue is assigned the number 070. For further
discussions on this issue, please refer to this issue number or use this
thread.

 

From: Gottfried
Zimmermann [mailto:] 

Sent: Monday, October 06, 2008 9:33 AM

To: Ram Jeyaraman

Subject: NEW Issue - Content negotiation for PresentationUrl

 

Please defer discussions on this issue until a time this
issue is accepted and is assigned a number.

 

Description:

 

Document: DPWS

Line number: 407-409

Owner: Gottfried Zimmermann

 

Description:

Currently, DPWS requires the <wsdp:PresentationUrl> to
serve an _HTML_ page for the device.  The restriction to
presentation pages in the HTML format is deemed unnecessary and prevents the
more sophisticated mechanism for content negotiation via HTTP headers, as
specified in RFC 2616.  For example, a client may prefer Flash-format
(MIME type application/x-shockwave-flash) presentation pages to HTML
presentation pages.  Or another client would like to retrieve a Target Description
file (MIME type application/urc-targetdesc+xml, see ISO/IEC 24752-4) from the
presentation page URL.  In any case, the device could use content
negotiation to deliver the requested format, or default to an HTML page.

 

Proposed Resolution (changes in red):

wsdp:ThisModel/ wsdp:PresentationUrl

URL to a presentation page
for this DEVICE. It MAY be relative to a base URL and MUST have fewer than
MAX_URI_SIZE octets. The format and content of the
presentation page MUST be determined by content negotiation, as specified in
RFC 2616. If a presentation URL is specified, the device MAY provide multiple
versions of a presentation page, but MUST provide an HTML page at a minimum.

 

 

___________________________________________________

 

 Dr.
Gottfried Zimmermann

 ICT
Accessibility Architect

 Access
Technologies Group, Germany

 Phone
+49 7121 790806

 The watchword for today

___________________________________________________