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Subject: Issue 070 - DPWS - Content negotiation for PresentationUrl
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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:zimmermann@accesstechnologiesgroup.com] 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 ___________________________________________________ |
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