Add "author" and "party" to terminology, rewrite "claim" terminology

terms.html

@@ -5,9 +5,11 @@
 <dl class="termlist">
   <dt><dfn data-lt="claims">claim</dfn></dt>
   <dd>
-A digital representation of an assertion made about an <a>entity</a> by a specific <a>entity</a>.
-The entity about which the assertion is made is called the <a>subject</a> of the claim.
-The meaning of the claim (its semantics) is determined by its author.
+A digital representation of an assertion made, by a specific <a>entity</a>, about someone or something that exists.
+This 'someone or something that exists' is called the <a>subject</a> of the <a>claim</a>.
+This digital representation typically consists of an identifier (typically: an URI) 
+that represents this <a>subject</a>, and one or more attributes or properties (key-value pairs, or predicate-object graphs).
+The meaning of a claim (its semantics) is determined by its author.
 Claims can be authored by <a>issuers</a>, e.g., to construct a <a>verifiable credential</a> with, or 
 by <a>holders</a>, e.g., to include in a <a>verifiable presentation</a>.
 Different <a>issuers</a> and <a>verifiers</a> can reuse the same semantics for claims through the use of shared vocabularies and/or ontologies.