Produce a DER encoding of the following structure.
FieldID ::= SEQUENCE {
fieldType FIELD-ID.&id({IOSet}),
parameters FIELD-ID.&Type({IOSet}{@fieldType})
}
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(this.id);
v.add(this.parameters);
return new DERSequence(v);