Description Usage Arguments Value
countItems takes a composite object and a collection of types from 
of objects of interest and counts how many objects of those types occur 
in total in the composite collection.
| 1 | countListItems(composite, singletonTypes)
 | 
| composite | The composite object (e.g., list) from which to count items. | 
| singletonTypes | The collection of names of object types of interest 
(e.g.,  | 
The cumulative count of items of one of the types named in 
singletonTypes.
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