this data identifies the type of “storage medium and housing” that is used as the carrier for the content of a resource; a closed list of terms is used to identify whether the carrier of the content of the resource is an audio disc, or a computer disc, or a volume, etc.
data for this element must be Recorded from a vocabulary (Closed): the term(s) must be appropriate for the resource, even if they are not from the official list of terms
but be sure to check the resource carefully, if the data for the element is Core, or if the data is important for differentiating the resource from a similar resource