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Referred to a related thing: description logics again.

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http://lj.rossia.org/users/imz/ 2009-05-16 17:12:12 -04:00 committed by Joey Hess
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commit 6f8d8ca1e8
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doc/todo/pagespec_relative_to_a_target.mdwn
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@ -90,8 +90,12 @@ diff -urNX ignorepats ikiwiki/IkiWiki/Plugin/relative.pm ikidev/IkiWiki/Plugin/r
[[!tag patch]]
> This looks really interesting. It reminds me of XPath and its conditionals.
> This looks really interesting. It reminds me of [[!wikipedia XPath]] and its conditionals.
> Those might actually work well adapted to pagespecs. For instance, to write
> "match any page with a child blah", you could just write *[blah] , or if you
> don't want to use relative-by-default in the conditionals, *[./blah].
> -- [[JoshTriplett]]
> And it [[!taglink also_reminds_me|pagespec_in_DL_style]] of [[!wikipedia description logics]]: of course, given the relation `subpage` one could write a description-logic-style formula which would define the class of pages that are ("existentially") in a given relation (`subpage` or `inverse(subpage)*subpage`) to a certain other class of pages (e.g., named "blah") ("existentially" means there must exist a page, e.g., named "blah", which is in the given relation to the candidate).
> Probably the model behind XPath is similar (although I don't know enough to say this definitely).--Ivan Z.