BG-1: add http-parameters reference, clean up Content-Coding defn

draft-ietf-core-senml-data-ct.md

@@ -44,9 +44,11 @@ normative:
   IANA.senml:
   RFC7252: coap
   RFC5234: abnf
+  RFC7230: http0
   RFC7231: http
   IANA.media-types: media-types
   IANA.core-parameters: core-parameters
+  IANA.http-parameters: http-parameters
 informative:
   RFC4648: base
   RFC8949: cbor
@@ -90,9 +92,9 @@ Content-Format ({{Section 12.3 of -coap}}) provides just this
 information; enclosing a Content-Format number (in this case number 60 as
 defined for content-type application/cbor in {{-cbor}}) in the Record is
 illustrated in {{ex-2}}. All registered CoAP Content-Formats are listed
-in the Content-Formats
-{{subregistry<IANA.core-parameters}}{: relative="#content-formats"}
-of the CoRE Parameters registry {{-core-parameters}}.
+in the {{content-formats (COAP Content-Formats
+registry)<IANA.core-parameters}} {{-core-parameters}} as specified by
+{{Section 12.3 of -coap}}.
 
 ~~~
 {"n":"nfc-reader", "vd":"gmNmb28YKg", "ct":"60"}
@@ -134,17 +136,19 @@ Content-Type:
   In HTTP and many other protocols, used in a `Content-Type` header field.
 
 Content-Coding:
-: a registered name for an encoding transformation that has been or
-  can be applied to a representation.  Confusingly, in HTTP the
-  Content-Coding is then given in a header field called
-  `Content-Encoding`; we **never** use this term (except when we are
-  in error).
+: A name registered in the {{content-coding (HTTP Content Coding
+  registry)<IANA.http-parameters}} {{-http-parameters}} as specified by
+  {{Section 8.5 of RFC7230}}, indicating an encoding transformation
+  with semantics further specified in {{Section 3.1.2.1 of RFC7231}}.
+  Confusingly, in HTTP the Content-Coding is found in a header field
+  called "Content-Encoding", however "Content-Coding" is the correct
+  term.
 
 Content-Format:
 : the combination of a Content-Type and a Content-Coding, identified
-  by (1) a numeric identifier defined by the "CoAP Content-Formats"
-  {{subregistry<IANA.core-parameters}}{: relative="#content-formats"}
-  of {{-core-parameters}} as per {{-coap}} or (2) a Content-Format-String.
+  by (1) a numeric identifier defined in the {{content-formats (COAP
+  Content-Formats registry)<IANA.core-parameters}} {{-core-parameters}}
+  as per {{Section 12.3 of -coap}}, or (2) a Content-Format-String.
 
 Content-Format-String:
 : the string representation of the combination of a Content-Type and a Content-Coding.