Retrieve the value of an attribute column.
getAttributeColumn(object, attr_name, warn_missing = c("attr", "column"))
The value of the attribute (or NULL
if the attribute is not set or
the column does not exist)
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".