anchor.diff:    - username
     - password
     - name
  +
   properties:
  -- name: port
  +  port:
  +    default: 8080
   # ...
   ```
   
  
positive.code: consumes:
  - name: database_conn
    type: conn
  ```
  
  Then, in the application job's templates, it can use the connection information from the link:
  
negative.code: #!/bin/bash
  # Application's templated control script.
  # ...
  export DATABASE_HOST="<%= link('database_conn').instances[0].address %>"
  export DATABASE_PORT="<%= link('database_conn').p('port') %>"
  # ...
  ```
  
  