PostGIS uses -1 as the default "unknown" SRID. Unfortunately, ISO uses 0. So we remain tempted to flip to 0. It is the one of the major "breaking" changes we would have to do to get to SQL/MM conformance (the others are changing the type numbers for ZM geometry variants in AsBinary).
Since GEOS generally seems to use 0, how about we stick to that?
Are we suffering a terminology breakdown here? You're talking about SRID in WKB, but the WKB spec doesn't include SRID. Only the EWKB implementation, which is our own concoction, does that. As long as the changes don't end up breaking the standards compliant WKB output, things should be OK... I wonder what others think?
Yes, understood. Except GEOS's wkb output also includes dimension information. That's not part of the original WKB spec, but I see hints that it was later added (although I've never actually seen the document).
I think what Frank and I were thinking about is the way to go - keep WKB the same by default but let clients change settings if necessary. Since GEOS is used extensively with PostGIS, it sure would be helpful for it to also support EWKB fully.
Charlie
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