Is support of older EPSG database needed?

[Martin Desruisseaux]

Hello all

Apache SIS is capable to connect directly to an EPSG database version 
9.x without the need to convert the database to some project-specific 
schema. It allows, for example, to connect to many EPSG databases for 
different versions. Therefore, authority codes like "EPSG:9.7:4326" and 
"EPSG:9.9:4326" (for example) will use the versions 9.7 and 9.9 
respectively of the EPSG database for the same 4326 code, if those 
versions are available on the user's machine.

We are upgrading the EPSG database from version 9.9.1 to 11.012. But 
there is some changes in the EPSG schema introduced in version 10 which 
need to be reflected by changes in the Java code. Consequently, it would 
be a little bit difficult to support both versions 9.x and versions 11.x 
of the EPSG database. Is there any objection to drop support for 
versions 9.x of the EPSG database? Note: if support for versions 9.x was 
needed, it could be done by creating SQL views. But it would require 
some work.

    Martin