On Tue, Nov 26, 2019 at 02:06:25PM -0800, C K Kashyap wrote:
> It seems to work as expected using collects :) Here's the complete program
> - it prints out ITEM1 and ITEM6 as expected.
Ah, right, you select items, not tags, and items have a *list* of tags.
OK. Then to get AND, you can instead of an explicit OR clause
...
(or ((same @Col1 @Tag v nm)) ((same @Col2 @Tag v nm)))
...
simply employ the inherent AND mechanism of Pilog/Prolog
...
(same @Col1 @Item tgs v nm)
(same @Col2 @Item tgs v nm)
...
With your example, this works:
(pilog
(quote
@Col1 "RED"
@Col2 "BLUE"
(select (@Item)
(((nm +TagVal @Col1 nm +TagVal @Col2) (v +Tag) itm))
(same @Col1 @Item tgs v nm)
(same @Col2 @Item tgs v nm) ) )
(print-item @Item) )
BTW, as the names of +TagVal seem unique, and substrings are not searched, it is
better to use +Key instead of +IdxFold:
(class +TagVal +Entity)
(rel nm (+Key +String))
☺/ A!ex
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