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Hi Randy, I do not know that OpenMRS has moved away. I was only consulting with them when they were initially interested in multi-level modeling. As far as I know they thought the move was too complex. Why I say that EAV is unsustainable is the same reason I say that a typical data model is unsustainable. Your entire application is model dependent to a level that when your model changes; previously recorded data (think in terms of decades) is no longer valid within the application. It is a given that healthcare is a continuously change landscape. Now, multi-level model applications are also model dependent. However the difference is that using a constraint based approach allows you to use a very "loose" software level dependency and transfer with the data, the semantic context (in terms of constraint definitions) in which the data was recorded. This gives a much longer term (hopefully forever but we cannot guarantee that because we cannot know the full extent of the future) durability and validity of the recorded data. Kind Regards, Tim PS. I have taken the opportunity to CC this to our developers mailing list. There is also a Users list at oship-users@xxxxxxxxxxxxxxxxxxx if you would like to post more questions there. We are very open and inclusive community and believe fully that knowledge at whatever measure should be captured in more places than two people's machines. :-) On Fri, 2010-07-02 at 10:57 -0400, Randolph Neall wrote: > Hi Tim, > > OK, maybe there was a misunderstanding. But what you now say is > interesting. Why is EAV unsustainable? What caused OpenMRS (which I > studied at one point) to switch away from EAV? What were the issues? I > am VERY interested in your response. > > Thanks, > > Randy > > > On Thu, Jul 1, 2010 at 8:49 PM, Tim Cook <timothywayne.cook@xxxxxxxxx> > wrote: > > Hi Randy, > > Maybe I misspoke or there was some other misunderstanding. I > have no > belief that EAV is a sustainable solution. > > The comment may have been regarding my attempts to help the > OpenMRS team > move from EAV to multi-level modeling? > > Regards, > Tim > > > > -- > *************************************************************** > Timothy Cook, MSc > Project Lead - Multi-Level Healthcare Information Modeling > http://www.mlhim.org > > LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook > Skype ID == timothy.cook > Academic.Edu Profile: http://uff.academia.edu/TimothyCook > > You may get my Public GPG key from popular keyservers or > from this link http://timothywayne.cook.googlepages.com/home > > -- *************************************************************** Timothy Cook, MSc Project Lead - Multi-Level Healthcare Information Modeling http://www.mlhim.org LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook Skype ID == timothy.cook Academic.Edu Profile: http://uff.academia.edu/TimothyCook You may get my Public GPG key from popular keyservers or from this link http://timothywayne.cook.googlepages.com/home
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