style(addressbook(obj-c)): add comments

SoObjects/Contacts/NGVCard+SOGo.m

@@ -480,6 +480,7 @@ convention:
   max = [elements count];
   if (max > 0)
     {
+      // We convert two email addresses at most
       workMail = [self _simpleValueForType: @"work"
                                    inArray: elements excluding: nil];
       homeMail = [self _simpleValueForType: @"home"
@@ -539,6 +540,11 @@ convention:
     }
 }
 
+/**
+ * Convert vCard to LDIF using the Mozilla LDAP Address Book Schema
+ *
+ *  https://wiki.mozilla.org/MailNews:Mozilla_LDAP_Address_Book_Schema
+ */
 - (NSMutableDictionary *) asLDIFRecord
 {
   NSArray *elements, *categories;

SoObjects/Contacts/SOGoContactFolder.h

@@ -1,6 +1,5 @@
 /*
-  Copyright (C) 2006-2011 Inverse inc.
-  Copyright (C) 2004-2005 SKYRIX Software AG
+  Copyright (C) 2006-2017 Inverse inc.
 
   This file is part of SOGo.
 

SoObjects/Contacts/SOGoContactSourceFolder.m

@@ -136,8 +136,14 @@
   NSArray *type;
 
   resourceType = [NSMutableArray arrayWithArray: [super davResourceType]];
+
+  // CARDDAV:addressbook
+  // https://datatracker.ietf.org/doc/html/rfc6352#section-5.2
   type = [NSArray arrayWithObjects: @"addressbook", XMLNS_CARDDAV, nil];
   [resourceType addObject: type];
+
+  // CARDDAV:directory
+  // https://datatracker.ietf.org/doc/html/draft-daboo-carddav-directory-gateway-02#section-4.1
   type = [NSArray arrayWithObjects: @"directory", XMLNS_CARDDAV, nil];
   [resourceType addObject: type];