PROTOCOL.md: update 'delete' description.

doc/PROTOCOL.md

@@ -258,11 +258,10 @@ Server Response
 :	The response contains a [Minimal Response].
 
 
-### Record delete
+### Record(s) delete
 
-Request the deletion of the record identified by the SIP. The SIP references always the recordId SIP_
-might reference a form 'SIP_FORM' (whereas a tableName is derived from) or 
-reference a tableName directly 'SIP_TABLE'. 
+Request the deletion of the record identified by the SIP. The SIP might contain a SIP_TABLE and/or a SIP_FORM.
+If both are specified, SIP_FORM will be taken. With SIP_FORM, the tableName is derived from the form. 
 
 Request
 :	api/delete.php
@@ -275,6 +274,7 @@ URL Parameters
 
 Server Response
 :	The response contains a [Minimal Response].
+	[Redirection Response] may be included.
 
 
 ## Glossary