license-type Type of License
Type of license described by the <license> element.
OPTIONAL on element: <license>
|Text, numbers, or special characters||The type of license, for example, “open-access” for a license permitting unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited; or “ccc” for a Copyright Clearance Center statement.|
|Restriction||This is an optional attribute; there is no default.|