Gavin Brelstaff wrote:
>How do we generate "archetype rules" to provide constraints >internally within archetypes. >We would like to use such rules to constrain data at it's point of >entry on the client. We already generate handler code (in Javascript) >to ensure the data-type and range constraints are valid. > what we did in the Eiffel implementation of GEHR was: - when an XML archetype is read from the database, it is turned into Eiffel objects. - for information creation, the archetype in memory has its create_default() routine called; this creates an initial data instance (say of a blood pressure of whatever). Each part of such an instance (which is of course a network of instances) is connected to a relevant part of the archetype (also a network of instances in memory) - Data modification commences by the users on the data instances, with each routine which causes a change calling a a corresponding validating routine on the archetype. If this routine returns true, the modification is allowed; else it returns false, with an error message whcih can be used on the screen (e.g. "systolic blood pressue must be between 0 and 500). - Changes proceed in this fashion until the user is satisfied and hits the "commit" button, which writes the information to the db. A detailed explanation of what happens is given at: http://www.gehr.org/technical/kernel_architecture/kernel_architecture.html (see section 6 of the documents). In openEHR, we will do the same thing (in variaous languages - not jsut Eiffel) but it will be more systematic. hope this helps, - thomas beale > > >I can find no mention of any "archetype rules" in the openEHR >Reference Model nor in the "Design Principles" document. >In fact, all I can now find is the example of an >invariant on page 25 of Thomas Beale's "Archetypes" report >(I've the version issued 21 /Aug/01). > >Am I missing something obvious or have "archetype rules" been >omitted, delayed from consideration? If so why? > > >I do hope you can help. > > -- .............................................................. Deep Thought Informatics Pty Ltd mailto:thomas at deepthought.com.au openEHR - http://www.openEHR.org openEHR drafts - http://www.deepthought.com.au/health/openEHR/openEHR.html Archetype Methodology - http://www.deepthought.com.au/it/archetypes.html Community Informatics - http://www.deepthought.com.au/ci/rii/Output/mainTOC.html .............................................................. - If you have any questions about using this list, please send a message to d.lloyd at openehr.org
