Hi Dan, On Sat, 2009-01-17 at 01:28 +0300, Dan Korostelev wrote: > Hi Tim. > > Unfortunately I didn't follow the discussion lately, so may be the > problem is no more, but...
There has been a tremendous amount of help from folks like you. However there is still not a solution. I have been asked several times for a 15 minute overview. This is tough given the complexity but allow me to ask the question at a more basic level. I believe it is similar to the way I asked it last year, but here goes. I'm not going to address Field or Object here, just explain the basics. class DataStructure(Persistence): """abstract class""" class ItemStructure(DataStructure): """abstract class""" class ItemList(ItemStructure): u""" Logical list data structure, where each item has a value and can be referred to by a name and a positional index in the list. The list may be empty. """ items = List( value_type=Object(schema=IElement), title=_(u"items"), description=_(u"""Physical representation of the list."""), required=False ) class ItemTable(ItemStructure): u""" Logical relational database style table data structure, in which columns are named and ordered with respect to each other. Implemented using Cluster-per-row encoding. Each row Cluster must have an identical number of Elements, each of which in turn must have identical names and value types in the corresponding postions in each row. Some columns may be designated 'key' columns, containing key data for each row, in the manner of relational tables. This allows row-naming, where each row represents a body site, a blood antigen etc. All values in a column have the same data type. Used to represent any data which is logically a table of values, such as blood pressure, most protocols, many blood tests etc. Not used for time-based data, which should be represented with the temporal class HISTORY.. The table may be empty. """ class ItemSingle(ItemStructure): u""" Logical single value data structure. Used to represent any data which is logically a single value, such as a person's height or weight. """ ************************************************* There are others and I left out the attributes and methods of these classes; with the exception of ItemList attribute 'items', where it is a zope.schema List but the value types are restricted to the schema described by IElement (also part of openEHR); but I think you get the idea. These classes are used as the base software for all openEHR applications. Of course the classes get more complex and deal directly with healthcare related issues. Now there are thousands of applications that will have data instance with attributes expressed in classes based on the above software that represent single (but complete) clinical concepts. But not all application user interfaces will use all available attributes of the concept. One may use an ItemTable and another an ItemList but they will both be valid in ANY application because the attribute represents a legal instance of ItemStructure. When that data instance is sent from application to another the receiving applications still needs to know the complete semantic context of when that data was collected. Think medico-legal, research and decision support over the lifetimes of patients and populations. So even if the user didn't see all the options in their GUI; it is still all contained in the data that was transfered. So how do I build my schemas so that Zope does the validation of nested schemas and even lets me use standard widgets? I hope this was less than 15 min. For those that want specific examples I can list a few. Cheers, Tim
Description: This is a digitally signed message part
_______________________________________________ Zope-Dev maillist - Zope-Dev@zope.org http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )