*
* @param[in] ctx to allocate value boxes in.
* @param[out] out a list of #fr_value_box_t to append to.
- * @param[in] resume function to call.
+ * @param[out] child to evaluate. If a child needs to be evaluated
+ * by the caller, we return XLAT_ACTION_PUSH_CHILD
+ * and place the child to be evaluated here.
+ * Once evaluation is complete, the caller
+ * should call us with the same #xlat_exp_t and the
+ * result of the nested evaluation in result.
* @param[in] request the current request.
+ * @param[in] head of the list to evaluate
+ * @param[in,out] in xlat node to evaluate. Advanced as we process
+ * additional #xlat_exp_t.
* @param[in] result Previously expanded arguments to this xlat function.
+ * @param[in] resume function to call.
* @param[in] rctx Opaque (to us), resume ctx provided by xlat function
* when it yielded.
*/