Custom containers is a simple way to provide own implementation of standard container types, thus allowing for easy extensibility of the collections language.
Provided the following declaration is reachable from the model currently being edited...
... one can use the weak version of hashmap thusly:
map<Object, int> myMap= new weakHashMap<Object, int>;
Custom Containers Declaration
A root node of concept CustomContainers may have one or more declarations.
any valid identifier
one of the existing container types of the collections language
Java classifier which represent implementation of the container
(optional) container creation expression;