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[Catacomb] DASL and pluggable-db
I just searched the Subversion developer mailing list for any discussion
of the DASL (DAV Searching and Locating) protocol and, surprisingly, the
only discussion I found was within a very recent thread . As one of
the original architects of the Catacomb project , and specifically
the DASL support implemented in the search module called from
mod_dav_dbms, I have a high degree of interest in this functionality.
Hopefully you'll tolerate questions from someone who is only moderately
familliar with the Subversion architecture. :-)
Glen Thompson mentions the issue of providing a pluggable DB layer
before addressing DASL-like functionality. I'm curious as to the reason
Glen feels this way - is there a compelling architectural reason for
this? We took the opposite approach wrt Catacomb, implementing DASL
support first, and now are beginning to address pluggable DB backends.
The Catacomb DB schema is simpler than that of Subversion, yet a layer
of indirection could be provided in supporting DASL such that a search
handler is provided along with the DB access layer needed to support a
given DB? Bolting on search after designing pluggable-db would seem to
require some reengineering effort because the way DASL is implemented
will depend largely on the storage layer implementation.
I'll make an attempt to follow the pluggable-db discussion as it
evolves, hopefully we'll be able to support eachother in this parallel
effort to some degree.
 Beginning of thread is at
but mentions DASL in
 <http://webdav.org/catacomb/> Note that the posted architecture
document is somewhat out of date wrt the current release.