Property:Has CORE2018 Rank

Has type: Has type::Text The allowed values for this property are:
 * Allows value::A* - flagship conference, a leading venue in a discipline area
 * Allows value::A - excellent conference, and highly respected in a discipline area
 * Allows value::B - good conference, and well regarded in a discipline area
 * Allows value::C - other ranked conference venues that meet minimum standards