Issue 121 - DPWS - Consistency problem with the metadata version inws-discovery and the metadata of devices

[Ram Jeyaraman <Ram.Jeyaraman@microsoft.com>]

This issue is assigned the number 121. For further discussions on this issue, please refer to this issue number or use this thread.

 

From: Elmar Zeeb [mailto:elmar.zeeb@uni-rostock.de]
Sent: Monday, December 15, 2008 3:25 PM
To: Ram Jeyaraman
Subject: New Issue for DPWS

 

Description: Consistency problem with the metadata version in ws-discovery and the metadata of devices
Document: wsdd-dpws-1.1-spec-wd-02
Line number:

There is a consistency problem with the metadata version in ws-discovery and the metadata of DEVICEs:

(1) In a static scenario, a CLIENT can directly retrieve the metadata of a DEVICE but doesn't know the metadata version.

(2) A CLIENT knows the metadata version of a DEVICE and retrieves the metadata. At the same time or shortly before the CLIENT receives a hello message with a higher metadata version. In this scenario the client can't detect if the retrieved metadata version is valid.

Proposed solution: Include a metadata version attribute in the relationship element or in the metadata section

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  Dipl.-Inf. Elmar Zeeb

  Universität Rostock, Fakultät f. Informatik und Elektrotechnik

  Institut f. Angewandte Mikroelektronik und Datentechnik

  University of Rostock, Faculty of CS and EE

  Institute of Applied Microelectronics and Computer Engineering,

  18051 Rostock

  Deutschland/Germany

  Tel. : ++49 (0)381 498 - 7262

  Fax  : ++49 (0)381 498 - 7252

  Email: elmar.zeeb@uni-rostock.de

  www  : http://www.imd.uni-rostock.de/, http://www.ws4d.org/

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