This directory has a very specific layout that the tools depend on.
Schema creation DDL files have the name
"create-<schema>-<version>.sql" Schema removal file shave the name
"drop-<schema>-<version>.sql".  Upgrade scripts have the name
update-<schema>-<oldversion>-<newversion>.sql.  Currently, update
scripts must have the exact version installed for oldversion and the
exact newest version for newversion in order to be correctly applied.

While the create script in this directory does things the way we
always do them (creating a schema and then tables within that schema),
these scripts can potentially do anything at all to the database.
Just note that you should always provide create and drop scripts, and
that you should make sure everything is named so that future update
scripts can tweak things.

These scripts are run by the schema-tool script provided with the
portal.  You can also look at sa_meta.versions directly (as well as
other tables in that schema) to see meta information about what portal
schemas are installed.
