[ESDS] Interaction models for Discovery Services

[Mark Harrison <[e-mail]>]

Dear ESDS colleagues,

Following on from the previous discussions on this mailing list about  
the interaction between Discovery Services and 'Consolidated  
Information Brokers', I have attached a couple of Powerpoint  
presentations, which I presented 3 weeks ago at a face-to-face meeting  
of the EPCglobal Data Discovery Joint Requirements Group.

The presentation on the interaction models considers the possible  
sequences of message flows between a query client, an information  
resource and a Discovery Service, considering suitability of each  
model for one-off queries as well as standing queries, together with  
an analysis of their relative merits in terms of protecting the  
confidentiality of information resources, confidentiality of clients'  
queries, as well as considering the kinds of data to be stored in a  
DS, performance and latency issues and impact on the network traffic  
and possible security threats.

The slides are intended to provide an easy-to-read animated summary of  
the analysis contained in section B of  the document D2.4 from the  
BRIDGE project (High-level design document).

	http://www.bridge-project.eu/data/File/BRIDGE%20WP02%20High%20level%20design%20Discovery%20Services.pdf

I would also like to acknowledge that the original BRIDGE document  
D2.4 section B was jointly authored by Trevor Burbridge (BT), Oliver  
Kasten (SAP), Cosmin Condea (SAP) and Mark Harrison (University of  
Cambridge, Auto-ID Lab), with additional inputs from Nicholas Pauvre   
(GS1 France) and members of AT4 wireless (who led BRIDGE WP2).


I have also attached an Excel spreadsheet which indicates some of the  
advantages and disadvantages from the perspectives of the client,  
resource, DS and network traffic, together with some possible  
countermeasures.  Feel free to modify the spreadsheet - though I  
suggest that you highlight any changed cells (e.g. set background  
colour of cell to yellow) so it is clear to everyone which changes you  
have made.

I really hope that these presentations and the spreadsheet will  
stimulate some lively discussion on this mailing list and I look  
forward to reading your comments about the different interaction  
models for Discovery Services.

Best regards,

- Mark Harrison

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