Re: TMQL: Direct (super|sub)types?

Dear Lars,

A simple use case will be just to provide a graphical visualization of 
the hierarchies in the topic map.

For example, I would use the direct-subtype path expression when 
building the following hierarchy graph for the works in the Italian Opera:

    work .
         +---- Literary work .
         |                   +-- Dictionary
         |                   +-- Novel
         |                   +-- Novella
         |                   +-- Play
         |                   +-- Poem
         |
         +----- Musical work .
         |                   +-- Aria
         |                   +-- Ballet
         |                   +-- Opera

...

Or maybe, you prefer to avoid from having "direct-supertypes" and 
"direct-subtypes" in TMQL because we can always use association pattern 
as an alternative:

t1 / supertype-subtype(subtype->supertype)
# is the same as:
t1 / direct-supertype

Kind regards,

Rani






On 01-Mar-2011 10:02, Lars Heuer wrote:
> Hi Robert,
>
> [...]
>> Topic type A is a direct subtype of topic type B, if and only if 'A
>> ako B' is true.
>
> Do you have a use case for it? In my way of thinking X is an instance
> of Y or not. Regardless how the relationship was established and how
> many associations are involved to model the relationship. Why do you
> need (in)direct (super|sub)types?
>
> Best regards,
> Lars

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