Retrieve the value of an attribute column.
getAttributeColumn(object, attr_name, warn_missing = c("attr", "column"))
The object to extract the attribute value from.
The name of the attribute to extract
Give a warning if the "attr"ibute or "column" is missing. Character vector with zero, one, or both of "attr" and "column".
The value of the attribute (or NULL
if the attribute
is not set or the column does not exist)