t1-t2-t3-t4-...-tN

   c1---c2-----c3--c4

db.host = $DBHOST$
db.host = $DBUSER$
db.host = $DBPASS$

[extensions]
hgext.keyword=
[keyword]
# expand keywords in all python files in working dir
**.conf =
[keywordmaps]
DBHOST = dev.server.internal
DBUSER = myname
DBPASS = mypass

<connectionStrings configSource="connections.config" />