Namespaced IDs for inputs/outputs
NS(namespace, id = NULL)ns.sep
The character vector to use for the namespace. This can have any length, though a single element is most common. Length 0 will cause the id to be returned without a namespace, and length 2 will be interpreted as multiple namespaces, in increasing order of specificity (i.e. starting with the top-level namespace).
The id string to be namespaced (optional).
An object of class character of length 1.