Re: [Semediawiki-user] Rule support in SMW?

[Temlakos <tem...@gm...>]

Someone once built an "invert-property" template to generate code 
automatically to annotate any article with a designated inverse of any 
Page property that points to the article in question. For example:

{{Invert-property|Member of|Includes}}

annotates the article in which it appears with several [[Includes::...]] 
brackets, each naming an article that names the index article as 
[[Member of::...]]

That's as close as SMW currently gets to rule support.

The kind of rule support you named would obviously replace this kind of 
inverse annotation, and would be especially useful with the syllogism 
you mentioned in your second example.

And here's another suggestion:

If A is the brother of B, then B might be either the brother /or the 
sister/ of A. It all depends on the gender of B. Therefore there's more 
to that relationship than a simple inverse. Rule-making would make such 
annotation a lot simpler.

I would point out just one problem, however. Storage refreshment is a 
continual problem in SMW, and will only get worse with this kind of rule 
support. That's because queries always go to the stored value in the SMW 
tables, not the table containing the article text. And whenever you 
change a primary annotation, you have to refresh every article that 
refers to it.

I've noticed something else, though this might not be germane to this 
problem. If, for any reason, the supporting script for a data type has 
any material change, that requires an edit-and-save to virtually every 
article that uses that data type in a way that the change affects. As 
you all know, I have a custom data type in my wiki. Earlier this week I 
noticed that it was storing some wrong date values. Specifically, it was 
storing Julian days that were a year ahead of where they should have 
been, and it was causing that data type to report wrong dates in other 
calendar formats. So I finally debugged the functions involved, but then 
I had to edit-and-save every single article annotated in that calendar, 
so that other articles that /queried/ those articles with #ask or #show 
statements could see the change.

BTW: I have  a wiki with 3,870 articles in it. The script 
SMW_refreshData.php doesn't seem to get everywhere I need it to get, 
even if I run it in slow doses. Can anyone recommend a better technique 
for using that file?

Temlakos

Jie Bao wrote:
> Hi all
>
> I'm wondering if rule support is gonna to be part of SMW at the php
> level in the near future. What I mean "rules" are like
>
> * if A is brother of B, then B is brother of A
> * if A is a member of B and B is part of C, then A is a member of C
> * if A has an author B, then B is a person
>
> Thanks
>
> Jie
>
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