[Ex-plain] ZeeRex - add 'operators'?
azaroth at liverpool.ac.uk
Wed May 22 13:51:51 CEST 2002
> > For each index, list all the operator names supported by that
> > index. (This is in addition to my previous proposal.)
> Still sounds heavyweight to me. Do we honestly envisage a single
> database in which the same truncation is done in different ways on
> different indexes? "To right-truncate searches on the AUTHOR index,
> use BIB-1's 5=1, but to on the TITLE index, use the Utility set's 5=4"
No, and you couldn't describe this in Alan's suggestion anyway.
But there will be Lots of indexes that don't support all the different
> I don't. Let's just give a single list of truncations and relations
> at the top level, with the understanding that all indexes which
> support any given truncation or relations do so using the specified
> attribute. It's easy enough to discover if a particular index doesn't
> support right-truncation at all.
By testing and seeing if it fails you, the same way as you can test a USE
attribute and see if it fails...
I agree with Alan here, something like the following isn't too much work.
And if people don't want to put it in, then they don't have to.
(numbers and names are off the top of my head)
,'/:. Rob Sanderson (azaroth at liverpool.ac.uk)
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