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
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