anchor.diff:  
   See also the section "Field value types" below.
   
  -### Label (`Field_label`)
  +=== Label (`Field_label`)
   
   A short textual label for the field.  The label is displayed as part of the form in which the field appears.
   
  -### Help (`Field_comment`)
  +=== Help (`Field_comment`)
   
   A longer textual description of the field.
   
  
positive.code: 
  * Reference to linked entity (`Value_entity`), used with `RefMultifield` render type: the displayed value is one or more fields selected from a linked entity (e.g., a reference to an entity record containing an image and description can be displayed as image and descripotion fields from that record.)  When editing, a selection is made from a dropdown list of available entities.
  
  ### Position/size (`Field_placement`)
  
  Used to specifying the position of of a field in a form display, specified in terms of width and horizontal placement on a responsive display grid <sup>1,2</sup>.
  
  
negative.code: * `View` - identifies a view description; subsumed by `Enum_choice`.
  
  
  == Field value types
  
  Field value types are identified by URIs or CURIEs that are used to identify some value type.
  
  