By the way: however we call it, this property already has another nice side effect. Since SMW now keeps track of all pages where a property was used with an unsuitable value, SMW can automatically revisit these pages when the type of a property has changed. Example:
* For storing street address information, you try to assign the value "21a" to the property "house number" on a page. * It turns out that "house number" [[has type::Number]], so the page you store shows an error. * You notice the error and go to the page Property:House_number to change it to say [[has type::String]] (which would be the best choice here). * Up to SMW 1.4.2, the page where you entered [[house number::21a]] would still miss the value until someone would edit it again. From SMW 1.4.3 on, this error will be corrected automatically using jobs (as usual, it can take some time if many pages need update). This new behaviour also prevents you from loosing any data when someone changes (accidentally or on purpose) the datatype of a property to become incompatible with most of the existing values: after correcting the type, all the old value will be coming back to you without having to edit all affected pages. -- Markus P.S. In any case, the page that you see, and the contents of the store may temporarily differ. After you change the property type, the page will still continue to display the error until its cache is cleared next time (this happens by itself or when somebody edits it). This time is unrelated to the time when SMW will fix its internal records of the page's values (both in SMW 1.4.2 and 1.4.3). So you may see an error on a page while its records are already fixed, or you may see a correctly looking page while its records are still waiting for repair. On Montag, 3. August 2009, Markus Krötzsch wrote: > On Sonntag, 2. August 2009, Markus Krötzsch wrote: > > ... > > > > I should note that I hope that properties with blank values don't get > > > included in this accounting. Speaking of which, let me note that I also > > > think it would be great if blank values stopped being viewed as errors > > > in general. > > > > The problem is that a value object can only have two states right now: > > either it represents some value, or it returns an error. But maybe one > > could ignore empty strings right during parsing to avoid getting any > > feedback at all. Feel free to file a request ... > > Do not file a request: it's done. Completely empty values (not even a > space) are now ignored in [[ :: ]]. No more errors. > > -- Markus > > > > -Yaron > > > > > > > > > On Sun, Aug 2, 2009 at 9:32 AM, Markus Krötzsch < > > > > > > mar...@semantic-mediawiki.org> wrote: > > > > The upcoming SMW release 1.4.3 will introduce a property that helps > > > > to find input errors: its value will be the page of the property that > > > > the wrong value > > > > was assigned to. For example, if you put > > > > > > > > [[my date property::not a date]] > > > > > > > > on page "Test1" (where the property would expect a valid date), then > > > > SMW will > > > > automatically store the value "Property:my date property" for > > > > "Test1". > > > > > > > > This is surely useful for maintenance. The question is how to call > > > > this new special property. Sufficiently descriptive names tend to be > > > > unwieldy, as for > > > > example "error for property" or "input error for". The point is that > > > > the property takes another property as its value, not an error > > > > message. > > > > > > > > User poll: How would you prefer this to be called? > > > > > > > > > > > > > > > > -- > > > > Markus Krötzsch > > > > Semantic MediaWiki http://semantic-mediawiki.org > > > > http://korrekt.org mar...@semantic-mediawiki.org > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > >-- -- ----- Let Crystal Reports handle the reporting - Free Crystal > > > > Reports 2008 30-Day trial. Simplify your report design, integration > > > > and deployment - and focus on > > > > what you do best, core application coding. Discover what's new with > > > > Crystal Reports now. http://p.sf.net/sfu/bobj-july > > > > _______________________________________________ > > > > Semediawiki-devel mailing list > > > > Semediawiki-devel@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/semediawiki-devel -- Markus Krötzsch Semantic MediaWiki http://semantic-mediawiki.org http://korrekt.org mar...@semantic-mediawiki.org
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