[tracker] Add some more use cases to Indices.list

[Jürg Billeter <juergbi src gnome org>]

commit 08da069c4ee746f4db45278d72a53b935b177c00
Author: Jürg Billeter <j bitron ch>
Date:   Thu Apr 1 13:37:29 2010 +0200

    Add some more use cases to Indices.list

 data/ontologies/Indices.list |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/data/ontologies/Indices.list b/data/ontologies/Indices.list
index ffd0881..e07bef3 100644
--- a/data/ontologies/Indices.list
+++ b/data/ontologies/Indices.list
@@ -1,6 +1,7 @@
 30-nie:
 * nie:url:
-  - ?
+  - For looking up the URN or other properties of a file where we already know
+  the URL/path. Used by tracker-miner-fs, for example.
 
 31-nao:
 * nao:hasTag:
@@ -25,19 +26,21 @@
   - ?
 
 * nmo:sentDate:
-  - ?
+  - Used for sorting messages when displaying all messages (or rather the last N).
 
 * nmo:conversation:
-  - ?
+  - Used for retrieving all messages of a specific conversation.
 
 * nmo:communicationChannel:
-  - ?
+  - Used for displaying all conversations on a specific channel (for example,
+  all conversations with a specific contact).
 
 * nmo:lastMessageDate:
-  - ?
+  - Used for sorting the list of all channels by time of last message.
 
 * nmo:hasParticipant:
-  - ?
+  - Used for retrieving the communication channel for a specific contact. Used
+  when inserting new messages, for example.
 
 * maemo:localPhoneNumber:
   - For matching against the local part of the phone number