Value,Acronym,Short Description,Reference
0,PKIX-TA,CA constraint,[RFC6698]
1,PKIX-EE,Service certificate constraint,[RFC6698]
2,DANE-TA,Trust anchor assertion,[RFC6698]
3,DANE-EE,Domain-issued certificate,[RFC6698]
4-254,,Unassigned,
255,PrivCert,Reserved for Private Use,[RFC6698]