This is the property collection interface.
Add an element to the collection.
Rest
Factors to add
Index of added elements
Verify that the element exists in the collection.
factors to check
True if element exists, false otherwise
Look up an element in the collection.
Factors to look up Index of
element. If element does not exist -1
Verify that the property key exists.
Index of properties to check
Property key is true if it exists, false if it does not exist
Remove an element from the collection.
Elements to be removed
Index of the element I did. If the element does not exist -1
This is the property collection interface.