An inherited blood coagulation disease that is characterized by deficiency of factor XI clotting factor and mild prolonged bleeding, especially of mucosal sites following trauma, and has_material_basis_in homozygous, compound heterozygous, or heterozygous mutation of the coagulation factor XI gene of chromosome 4q35.2. [ http://purl.obolibrary.org/obo/ECO_0007637 http://purl.obolibrary.org/obo/ECO_0007636 ]