Schemes is a container class that holds a list of Scheme objects, each
uniquely identified by their key property (usually derived from the class
name). It is used internally by the ggalign system to manage sets of layout
or rendering configurations that can be inherited, updated, or applied during
plot composition.
Schemes(...)<dyn-dots> A list of Scheme object.
Each Scheme in the container must have a unique key.
The key is used to reference and update individual schemes.
value: The underlying list of Scheme objects.
entries: A named list of schemes, where names are derived from their
keys.
keys: A character vector of all scheme keys.
Scheme