Dear all,

I am testing WCS 2.0 GetCoverage requests.
I have some questions about the following requirements, concerning scaling
extension (see OGC 12-039)

1) Req 4 getCoverage-mutually-exclusive

A *GetCoverage *request containing a scaling operation *shall *contain
exactly one of:

   - Scal::scaleByFactor,
   - Scal::scaleAxesByFactor,
   - Scal::scaleToSize,
   - and Scal::scaleToExtent


If a request contains more than one scaling operator, Mapserver does not
complain and takes the first one it checks (see mapwcs20.cpp#L1097
<https://github.com/MapServer/MapServer/blob/branch-8-2/src/mapwcs20.cpp#L1097>
).
Shouldn't it send an exception ?

2) Req 18 getCoverage-exception:
When a WCS server encounters an error while evaluating a scaleFactor or
scaleExtent
parameter in a GetCoverage operation it shall return an exception report
message chosen
as indicated in Table 7 with a locator parameter value as specified in the
right column
of Table 7 for each exceptionCode listed.

Exception values in table 7 are : InvalidCoverageType, InvalidScaleFactor,
InvalidExtent or ScaleAxisUndefined

If a request contains a negative value for a scale factor, Mapserver
returns an exception :
<ows:Exception exceptionCode="InvalidParameterValue" locator="request">
   <ows:ExceptionText>msWCSParseRequest20_XMLGetCoverage(): WCS server
error. Invalid scaleFactor '-0.2'.</ows:ExceptionText>
</ows:Exception>

However, the exception type is InvalidParameterValue, which is not in table
7.
Why doesn't it report the expected exception type : InvalidScaleFactor ?

Sincerely
Philippe
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