Hi Masoumeh
There is a difficulty that arises with data that is not completely entered and being able to save it in the repository in that state. One could argue that it should all be entirely consistent, but it does mean that it is not so easy to use in reality. I am always arguing for a degree of flexibility in the specs - you are free to put it in your software if you want it like that. Cheers, Sam From: [email protected] [mailto:openehr-technical-bounces at chime.ucl.ac.uk] On Behalf Of Masoumeh Seydi Sent: 21 December 2009 14:53 To: openehr-technical at openehr.org Subject: data types and structures questions Hi All, I've got some questions about data types and structures. I was wondering if someone could help me. 1. Why an item_single can,t be empty but other structures may be. I mean 'items" attribute's cardinality in item_single is 1..1 (and this is logical. coz' an item_single without element is meanless). But in other structures, the cardinality of "items" attribute is 0..1. What's the point of having an empty list or tree or table (without ant item in it)? 2. What's the difference between CLUSTER and ITEM_TREE? Both can have CLUSTERs and ELEMENTs. And why in all structures in CKM, there is a Data branch shown in archetype mindmap but in cluster archetypes, there is a Items branch? 3. There is an Interval intrface containing lower and upper attributes. Other intervals like IntervalOfReal, IntervalofDate, IntervalofDateTime, IntervalofTime and IntervalofDuration with lower and upper attributes in xsd file in the site. My question is, why there is not an Interval class that contains an attribute for declaring the type of interval and so get rid of other interval classes for every type? Thanks in advance Masoumeh -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openehr.org/mailman/private/openehr-technical_lists.openehr.org/attachments/20091221/cc624920/attachment.html>
