appendValue
Appends a value to a list-typed attribute. If the attribute does not exist, it will be created.
Parameters
key
The key for the attribute
element
The element to append to the existing (or new) list value of the attribute
Appends a value to a list-typed attribute. If the attribute does not exist, it will be created.
The key for the attribute
The element to append to the existing (or new) list value of the attribute