# HG changeset patch
# User František Kučera <franta-hg@frantovo.cz>
# Date 1376228888 -7200
# Node ID 93a75e48819c1a8bf28d8f69a8be85e5937da4c7
# Parent  149b604c319b10d4fc0d4fa3807bf064cfff571c
data: IM, OTT

diff -r 149b604c319b -r 93a75e48819c data/dictionary.xml
--- a/data/dictionary.xml	Sun Aug 11 13:42:41 2013 +0200
+++ b/data/dictionary.xml	Sun Aug 11 15:48:08 2013 +0200
@@ -43,6 +43,7 @@
 		<term abbreviation="" completeForm="latebiller" language="en"/>
 		<explanation language="en">
 			<text>
+				a technique used in charging;
 				for pre-paid subscribers the standard way to charge services is online
 				– subscriber's balance is checked in the billing system and if sufficient, the service (e.g. sending a SMS) is provided, otherwise the service is denied;
 				if the billing system is not currently available (so we can't say if the subscriber's balance is high enough), we can provide the service anyway and try to charge it later;
@@ -110,16 +111,21 @@
 	</concept>
 	<concept>
 		<term abbreviation="IM" completeForm="instant messaging" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<term abbreviation="OTT" completeForm="over the top" language="en"/>
+		<explanation language="en">
+			<text>
+				a kind of electronic communication between two persons or a group chat;
+				compared to e-mail, IM messages are short (few words, sentence) and the other side is expected (depending on his/her online status) to read and respond it immediately;
+				compared to SMS, IM messages are cheap – typically free of charge;
+				important IM feature is presence – the sender knows current status of the recipient: online, offline, away, busy etc.;
+				IM is rooted in the computer world but nowadays it is often used also on mobile phones as alternative to (expensive) SMS – in such case it is called OTT and requires mobile Internet connectivity;
+				IM messages are usually transferred over an TCP/IP protocol – good example is Jabber/XMPP which is free and open protocol for IM and presence based on XML
+			</text>
+		</explanation>
 		<tag>computer</tag>
 		<tag>messaging</tag>
 	</concept>
 	<concept>
-		<term abbreviation="OTT" completeForm="over the top" language="en"/>
-		<explanation language="en"><text></text></explanation>
-		<tag>messaging</tag>
-	</concept>
-	<concept>
 		<term abbreviation="IMAP4" completeForm="Internet message access protocol version 4" language="en"/>
 		<term abbreviation="IMAP" completeForm="Internet message access protocol" language="en"/>
 		<explanation language="en">