Attribute Name,Brief Description,Change Controller,Reference
href,reserved (not useful as target attribute name),IETF,[RFC6690]
anchor,reserved (not useful as target attribute name),IETF,[RFC6690]
rel,reserved (not useful as target attribute name),IETF,[RFC6690]
rev,reserved (not useful as target attribute name),IETF,[RFC6690]
hreflang,(Web Linking),IETF,[RFC8288]
media,(Web Linking),IETF,[RFC8288]
title,(Web Linking),IETF,[RFC8288]
type,(Web Linking),IETF,[RFC8288]
rt,resource type,IETF,"[RFC6690, Section 3.1]"
if,interface description,IETF,"[RFC6690, Section 3.2]"
sz,maximum size estimate,IETF,"[RFC6690, Section 3.3]"
ct,Content-Format hint,IETF,"[RFC7252, Section 7.2.1]"
obs,observable resource,IETF,"[RFC7641, Section 6]"
hct,HTTP-CoAP URI mapping template,IETF,"[RFC8075, Section 5.5]"
osc,hint: resource only accessible using OSCORE,IETF,"[RFC8613, Section 9]"
ep,"Endpoint Name (with rt=""core.rd-ep"")",IETF,"[RFC9176, Section 9.3]"
d,"Sector (with rt=""core.rd-ep"")",IETF,"[RFC9176, Section 9.3]"
base,"Registration Base URI (with rt=""core.rd-ep"")",IETF,"[RFC9176, Section 9.3]"
et,"Endpoint Type (with rt=""core.rd-ep"")",IETF,"[RFC9176, Section 9.3]"
ed-i,Hint: support for the EDHOC Initiator role,IETF,[RFC9668]
ed-r,Hint: support for the EDHOC Responder role,IETF,[RFC9668]
ed-method,A supported authentication method for EDHOC,IETF,[RFC9668]
ed-csuite,A supported cipher suite for EDHOC,IETF,[RFC9668]
ed-cred-t,A supported type of authentication credential for EDHOC,IETF,[RFC9668]
ed-idcred-t,A supported type of authentication credential identifier for EDHOC,IETF,[RFC9668]
ed-ead,A supported External Authorization Data (EAD) item for EDHOC,IETF,[RFC9668]
ed-comb-req,Hint: support for the EDHOC+OSCORE request,IETF,[RFC9668]