address #633

fixes  #633

index.html

@@ -2119,17 +2119,11 @@ <h2>Interaction Model</h2>
         <h3>Properties</h3>
         <p>
           A Property is an Interaction Affordance that exposes the state of the Thing.
-          <span class="rfc2119-assertion" id="arch-property-readable">
-            The state exposed by a Property MUST be retrievable (readable).
-          </span>
-          <span class="rfc2119-assertion" id="arch-property-writable">
-            Optionally, the state exposed by a Property MAY be updated (writeable).
-          </span>
-          <span class="rfc2119-assertion" id="arch-property-observable">
-            <a>Things</a> MAY choose to make Properties observable by pushing the new state after a change
+          The state exposed by a Property can be retrievable (readable).
+          Optionally, the state exposed by a Property may be updated (writeable).
+           <a>Things</a> MAY choose to make Properties observable by pushing the new state after a change
             (cf. Observing Resources [[?RFC7641]]).
-          </span>
-          Write-only state should be updated through an Action.
+         In the case of a write-only state, an Action can be used to update the state.
         </p>
         <p>
           <span class="rfc2119-assertion" id="arch-property-dataschema">