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Beware that only complete elements between separators will be found. The provider has to split the string according to expected searches, e.g.:
    Composite Infrared Spectrometer#CIRS
not    Composite Infrared Spectrometer (CIRS)

Parameters supporting multivalued lists include:
dataproduct_type (this one is best avoided when possible)
target_name
alt_target_name
target_class
instrument_host_name
instrument_name
measurement_type
bib_reference
processing_level


Defaut values (to be reviewed):
NULL/void: will never return an answer to a query using this parameter (TBC, seems ADQL-related. To be corrected if it is a limitation of the client)
For float / double : -inf for *_min +inf for *_max – still TBC (NaN won't do). To be tested on a real case.
Not needed for strings? (i.e. NULL/void is OK?)
Default behavior looks OK in fact. If we need to preserve the NULL values on queried parameters (ie, when NULL is considered as "I don't know"), this can be done with OR param = NULL (on option in the client? This is feasible manually on TapHandle)

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