RegTAP-1.1 & ADQL-2.1 - the ILIKE concerns

[Molinaro, Marco]

Dear ReR-ers,
(DAL-ers for reference)

in the process of reviewing RegTAP-1.1 PR from the DAL perspective
a consideration come up with respect to the strong dependency of
RegTAP-1.1 case insensitive comparison on ADQL-2.1 (PR itself)
ILIKE operator.

Two issues came up: RegTAP waiting ADQL for proper dependency
reference; too strong dependency/forcing of RegTAP requirement
over the ADQL specification.

The first is actually minor/can-be-worked-around, the latter is more
critical.

As things currently stand, there's the risk RegTAP controls ADQL behaviour
of ILIKE or that ADQL can break RegTAP when/if changing ILIKE definition.

Proposed solution is to re-instate the ivo_nocasematch in RegTAP,
decoupling the specifications and releasing the two issues above in one
shot.

Comments and discussion highly welcome (including detailed explanations
from the spec editors and thoughts from implementors).

Cheers
      Marco
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