/**
  * Combine all the map entries into the context stack.
  *
  * @param model The model data.
  * @return This builder.
  */
 public Builder combine(final Map<String, Object> model) {
   context.combine(model);
   return this;
 }
 /**
  * Combine the given model using the specified name.
  *
  * @param name The variable's name. Required.
  * @param model The model data.
  * @return This builder.
  */
 public Builder combine(final String name, final Object model) {
   context.combine(name, model);
   return this;
 }