Thanks alot, will try it out!

/Henrik

On Sun, Nov 23, 2008 at 7:38 PM, Alexander Burger <[EMAIL PROTECTED]> wrote:
> Hi Henrik,
>
>> (rel country  (+Ref +Link) NIL (+Country))
>> ...
>> Now if I want to have all the Germans, how would that generator look?
>> Maybe like this?:
>>
>> (country +User (db nm +Country @CountryName))
>
> It should be
>
>   (nm +Country @CountryName (country +User))
>
> The semantics are like this:
>
>   (var +Cls @Key)
>
> will generate all objects of '+Cls' that are found using '@Key'. You can
> then follow other relations to connected objects, either via '+Link's
> and '+Joint's
>
>   (var +Cls @Key link ...)
>
> or via other indexes
>
>   (var +Cls @Key (var2 +Cls2) ..)
>
>
> Perhaps it is best to take "app/er.l" and "app/gui.l" as examples. To
> find an article (+Item) via its supplier, the costruct
>
>   (nm +CuSu @Sup (sup +Item))
>
> is used. This means: Search all '+CuSu' (customers/suppliers) that match
> '@Sup', and then follow the 'sup' index of '+Item' to locate all
> corresponding items.
>
> Or, to find orders (+Ord) via the supplier
>
>   (nm +CuSu @Sup (sup +Item) (itm +Pos) ord)
>
> This again finds +CuSu by name, follows to the '+Items', then for each
> item locates all positions (+Pos), and then the '+Joint' to the order
> 'ord'.
>
> You see that this can be chained infinitely. The rule is that a symbol
> (here 'ord') specifies a direct link (or joint), while (sym +Cls)
> specifies an index.
>
> Cheers,
> - Alex
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