On 15/03/11 12:13, Jeroen De Dauw wrote: > Hey, > > Semantic Maps has a subclass of SMWDataValue for the coordinates data > type (which implements getDBKeys), and uses getDBKeys on instances of > this class in the SMWValueDescription deriving class for coordinates.
Of course, I am aware of this one! I do actually consider to move the type back into core, at least regarding part of the backend support for it. Our previous discussions indicated that it is hard to optimise for coordinates outside of the storage implementation, and it is also difficult to make the datavalue interface general enough to support the addition of such complex types without loosing some efficiency. So I guess I might make the store aware of geo as a basic type. > > I did a search through all extensions I have (which includes everything > that's in the Semantic Bundle (and not including SM)), and only found > SIO using getDBKeys, and nothing having a deriving class from SMWDataValue. Ok, thanks for checking. If this is all that is out there, then the current DV interface can indeed be simplified. I intend to make it less general: instead of supporting arbitrary datavalues that all represent a list of primitive values, I would rather support a small number of primitive types (and nothing else). Developers would then need to subclass these types to develop own datatypes, but that would not limit the flexibility since the compound type (currently used only for Record) can capture all types of data. For example, if geocoords would not be a primitive type, one would make them a compound of latitude and longitude, but this would decrease efficiency since an additional join would be needed in queries. Regards, Markus ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Semediawiki-devel mailing list Semediawiki-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/semediawiki-devel
