Hi,
yesterday I tried to apply Emily's patch that would
upgrade our EPSG database to version 6.18:
http://jira.codehaus.org/browse/GEOT-2493

Unfortunately I found a few show stoppers, the EPSG
database started using the degree symbol extensively
in axis directions, that symbol cannot be represented
in ASCII and HSQL 1.8 does not accept unicode escape
codes (v1.9 does, but it's alpha).
This results in quite a bit of test failures, but
also whatever information is extracted from the db
that uses non ASCII chars tends to be ruined.

I was considering a move to H2, and pushing HSQL
to unsupported land for 2.6, and then remove it
completely in the next iteration of Geotools.

H2 wise I think I would like to support both
the current approach of "db in the temp dir"
and a "db in the classpath". Both have value,
the first is significantly faster and easier
to implement, whilst the second is handier
in that it does not require to touch the
file system of the user.

Opinions? I noticed GeoToolkit also ditched
HSQL, but in favour of the Derby version that's
shipping with the JDK.

Opinions, preferences?

I for one prefer H2, mostly because we're already
using it extensively in GeoServer and GeoWebCache,
and we have a JDBC datastore based on it. But that's
just me, what do others prefer?

Cheers
Andrea

-- 
Andrea Aime
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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