Data Cascade Framework #37
Description
Develop framework components that make it easy to express "cascading" data sources in the model. For example, we might want an instance type to have a default in the model, which can be overridden by a variable in the user's preferences (the binding), which is overridden by a variable set on the instance label. Rather than having to hand-code this type of cascade over and over, it should be expressed using a common framework component that makes the arrangement obvious for that data element.