On Tue May 8 06:36:51 2007, sreekanth wrote:
> Why LDAP or ACAP cannot be used instead of XCAP??
>
>
LDAP lacks some details of a configuration protocol that are
thought
to be, or were thought to be, useful. In particular:
1) It is geared toward data strongly bound to a schema,
thought to be
bad because clients generally have unique features, which in
turn
require schema support and maintenance.
2) It lacks "push" of change data, thought to be
important to reduce
the change lag of long-running clients (such as messaging
clients and
VOIP applications).
3) It lacks the more useful horizontal attribute
inheritance,
providing only vertical attribute inheritance (which in
itself is
little used, partly because it's not used as a configuration
service). This is thought to be useful for site-wide
configuration
defaults.
ACAP does provide these (and misses out several key features
of a
directory, too - it's not that ACAP is better than LDAP,
it's just
better suited for this purpose).
XCAP doesn't provide any of them directly either, but
instead
supplies (2) by integrating the service with SIP, thus
really
providing a configuration bootstrap, rather than a full
service.
Apparently, though, XCAP is still thought to be suitable for
use as a
configuration service.
> -The following is from the XCAP presentation prepared
by Rosenberg..
> LDAP, ACAP, SNMP, relational DB cover related spaces,
none
> successfully deployed to broad end client bases
>
ACAP has seen comparitively low deployment, although
multiple clients
and servers do actually exist, and are used in production
deployments. LDAP, SNMP, and relational databases have all
seen very
high deployment, but are not as well suited to configuration
and
roaming data storage. Some deployment exists of LDAP as an
internet-accessible roaming data/configuration protocol,
whereas
RDBMs are often used for site-wide configuration and data
roaming.
While deployment levels of any of these are undoubtedly low
compared
to the levels of deployment of the protocols they support,
it's
certainly not true that they're zero, nor that the existing
deployments are unsuccessful.
> Can anyone clarify on this???
I can't speak for Rosenberg, and of course any debate is
pointless
now, but I hope I've shed some light on this.
Dave.
--
Dave Cridland - mailto:dave cridland.net - xmpp:dwdjabber.org
-
acap://acap.dave.cridland.net/byowner/user/dwd/bookmarks/
- http://dave.cridland.net/
Infotrope Polymer - ACAP, IMAP, ESMTP, and Lemonade
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