On Mittwoch, 26. August 2009, Jon Lang wrote: > Markus Krötzsch wrote: > > If applicable, inverse properties generally are linked to the page of the > > corresponding property (so "-developer of" links to "Property:developer > > of"). It is strongly suggested not to create property pages that are > > called like inverse properties (it won't destroy anything, but it might > > create unnecessary confusion). > > Could you give an example of this, please? In particular, what are > you meaning by "are linked to"?
Sorry, I was not very clear here: Sometimes property names are displayed somewhere, for example in the header of tables created by #ask. Such texts are often linked to the property's page. In case of inverses, links will go to non-inverse property pages. > > > Also, you cannot use inverse properties to enter semantic data > > into the wiki: all annotations must be on the page that is the subject of > > the non-inverted property. > > So inverse properties are like the "what pages link here?" Wiki feature? Very roughly, yes. > > > Inverses in queries are currently only supported if they are of > > Type:Page. > > That makes sense. > > > == Development Information == > > > > The main changes that I expect to be required in SMW extensions is in > > places where you deal with property subjects and silently expect them to > > be of Type:Page. If users can enter inverse properties, then a query for > > a subject can also return datavalues of other datatypes, so you need to > > use the generic datavalue API, or check the type of the datavalue first. > > Could you give an example of such a query, for illustrative purposes? What query do you mean? You mean the actual source code that uses inverse properties? It is not different from code using non-inverse properties, really. > > > I hope that SMW already works properly in all cases where inverses can > > occur. Feedback is welcome. > > This is a welcome step forward. The other feature that I'm hoping to > see relatively soon are transitory properties. This is much harder (I think you mean "transitive" here). Maybe not so soon ... -- Markus -- Markus Krötzsch <mar...@semantic-mediawiki.org> * Personal page: http://korrekt.org * Semantic MediaWiki: http://semantic-mediawiki.org * Semantic Web textbook: http://semantic-web-book.org --
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