more explanation added

index.bs

@@ -906,8 +906,11 @@ This specification also defines a number of attestation types. These define how
 attestation statement, after verifying that it is cryptographically valid.
 
 Attestation formats are orthogonal to attestation types, i.e. attestation formats in general are not restricted to a single
-attestation type. Broadly speaking, attestation formats pertain to the formatting of the attestation statement, while attestation
-types pertain to the semantics.
+attestation type. For example the "packed" attestation format (see below) can be used in conjunction with all attestation types.
+Broadly speaking, attestation formats pertain to the formatting / encoding of the attestation statement
+rawData, while attestation types pertain to the semantics.
+The privacy, the security and the operational characteristic of attestation mainly depends 
+on the attestation type while it is largely independent from the attestation format.
 
 
 ### Attestation Types ### {#attestation-types}