void
rdataFromString(Tokenizer st, Name origin) throws IOException {
	certificateUsage = st.getUInt8();
	selector = st.getUInt8();
	matchingType = st.getUInt8();
	certificateAssociationData = st.getHex();
}
Creates an SMIMEA Record from the given data
@param certificateUsage The provided association that will be used to
match the certificate presented in the S/MIME handshake. 
@param selector The part of the S/MIME certificate presented by the server
that will be matched against the association data. 
@param matchingType How the certificate association is presented.
@param certificateAssociationData The "certificate association data" to be
matched.
src/main/java/core/org/xbill/DNS/SMIMEARecord.java