The virtual class
Annotated is used to standardize the
storage of metadata with a subclass.
Annotated class supports the storage of global metadata in a
subclass. This is done through the
metadata slot that stores a list
In the code snippet below,
x is an Annotated object.
metadata(x) <- value: Get or set the list
holding arbitrary R objects as annotations. May be, and often is, empty.
The Vector class, which extends Annotated directly.
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