A single index of a container, which is a container itself.
This can be, e.g., a list, vector, or data frame.
Readonly
Distinctive lexeme of index e.g. 'name' for list(name = 'John')
list(name = 'John')
NodeId of index in graph.
Sub-indices of index.
A single index of a container, which is a container itself.
This can be, e.g., a list, vector, or data frame.
See