OCL21 — The following collection operations would be useful for the HL7 GELLO project:

The HL7 GELLO project would find it useful to have additional collection operators in OCL. A method to define these in the underlying model would be good. Alternatively, we request the addition of the following operations:

max, min: To determine the maximum or minimum value in a collection

firstN: Returns a sequence with the first n elements of this sequence

lastN: Returns a sequence with the last n elements of this sequence

reverse: Returns a sequence in reverse order

join(namesOfCollections; namesOfProperties; booleanExpression; orderByExpression)

Where:

• namesOfCollections is a list of strings separated by commas, where each

string represents the name of a collection from where data is retrieved.

• namesOfProperties is a list of strings separated by commas, where each

string is the full description of the properties from the objects in the

collections we want to get in the result.

• booleanExpression is a valid boolean expression containing the

conditions the elements from the collections defined in listOfCollections

must satisfy in order to be included in the result

• booleanExpression is a valid boolean expression containing the

conditions the elements from the collections defined in listOfCollections

must satisfy in order to be included in the result

average: Calculate the average value in a collection

stdev: Calculate the standard deviation of a collection

variance: Calculate the variance of a collection

median: Calculate the median of a collection

mode: Calculate the mode of a collection

No Data Available