Updates based on TDC Call

Author: darrelmiller

versions/3.0.md

@@ -1954,7 +1954,7 @@ paths:
             description: the user's address
 ```
 
-When a runtime expression evaluates to null, no parameter value is passed to the target operation.
+When a runtime expression fails to evaluate, no parameter value is passed to the target operation.
 
 Values from the response body can be used to drive a linked operation.
 
@@ -1981,7 +1981,7 @@ value), references MAY also be made through a relative `operationRef`:
 links:
   UserRepositories:
     # returns array of '#/components/schemas/repository'
-    operationRef: '#paths~12.0~1repositories~1/{username}'
+    operationRef: '#/paths~12.0~1repositories~1/{username}/get'
     parameters:
       username: $response.body#/username
 ```
@@ -1992,7 +1992,7 @@ or an absolute `operationRef`:
 links:
   UserRepositories:
     # returns array of '#/components/schemas/repository'
-    operationRef: 'https://na2.gigantic-server.com/#/paths/~12.0~1repositories~1{username}'
+    operationRef: 'https://na2.gigantic-server.com/#/paths/~12.0~1repositories~1{username}/get'
     parameters:
       username: $response.body#/username
 ```
@@ -2009,7 +2009,7 @@ This mechanism is used by [Link Objects](#linkObject) and [Callback Objects](#ca
 The runtime expression is defined by the following [ABNF](https://tools.ietf.org/html/rfc5234) syntax
 
 ```
-      expression = ( "$url" | "$method" | "$request." [ source ] | "$response." [ source ])
+      expression = ( "$url" | "$method" | "$statusCode" | "$request." source | "$response." source )
       source = ( header-reference | query-reference | path-reference | body-reference )  
       header-reference = "header." token
       query-reference = "query." name  
@@ -2028,7 +2028,7 @@ The table below provides examples of runtime expressions and examples of their u
 ##### <a name="runtimeExpressionExamples"></a>Examples
 
 Source Location | example expression  | notes
----|:---|:---|:---
+---|:---|:---|
 HTTP Method            | `$method`         | The allowable values for the `$method` will be those for the HTTP operation 
 Requested media type | `$request.header.accept`        |  
 Request parameter      | `$request.path.id`        | Request parameters MUST be declared in the `parameters` section for the parent operation or they cannot be evaluated.  This includes request headers.