From: Mike Taylor <mike@indexdata.com>
Date: Tue, 17 Jan 2006 11:10:30 +0000 (+0000)
Subject: New, almost empty
X-Git-Tag: YP2.0.0.2~55
X-Git-Url: http://sru.miketaylor.org.uk/cgi-bin?a=commitdiff_plain;h=3b2c31ffe908bb41d0660d8c8b875cd000b2caa2;p=metaproxy-moved-to-github.git

New, almost empty
---

diff --git a/doc/multidb b/doc/multidb
new file mode 100644
index 0000000..a70fc78
--- /dev/null
+++ b/doc/multidb
@@ -0,0 +1,18 @@
+$Id: multidb,v 1.1 2006-01-17 11:10:30 mike Exp $
+
+
+YP2 Virtual Databases and Multicast Searching
+=============================================
+
+Two of YP2's filters are concerned with multiple-database operations.
+Of these, "virt_db" can work alone to control the routing of searches
+to one of a number of servers, while "multi" can work with the output
+of "virt_db" to perform multicast searching, merging the results into
+a unified result-set.  The interaction between these two filters is
+necessarily complex, reflecting the real complexity of multicast
+searching in a protocol such as Z39.50 that separates initialisation
+from searching, with the database to search known only during the
+latter operation.
+
+### Much, much more to say!
+