Re: Drilling into the LOD Cloud

Damian Steer wrote:
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> [sorry, forgot to reply-all]
> 
> Peter Ansell wrote:
> 
> | That is fine for classes, but how do you map individuals without
> metadata side-effects?
> 
> Looking at my previous answer again I think I should take another run at
> this  :-)
> 
> One way of thinking about equivalence is in terms of substitution: if :x
> :equiv :y when is it safe to substitute :x with :y?
> 
> The default is: it's not safe (obviously).
> 
> :x equivalentClass :y -> safe when used as a class (e.g. rdf:type :x)
> :x sameAs :y -> always safe (watch out!)
> :x sameConceptAs :y -> safe in subject positions

do you mean subject in the 'topic, dc:subject' sense, rather than 
subject/predicate/object sense? On first reading I thought you meant the 
latter, which would be problematic since any inverse of property can 
flip values into 'object' role. So assuming the former, I quite agree.

Also thanks for expanding on what I meant. I was indeed picking a strong 
example to emphasise my (under articulated) case. Using an owl:sameAs 
claim between independently developed classes and properties is almost 
always misleading, confusing and untrue. So yup I agree that 
application-specific properties such as these are often more useful.

Also btw folks there is no such thing as dc:author. It was changed in 
the mid-late 1990s to be dc:creator, so as to better cover non-written 
creations such as images, museum artifacts etc. So best to avoid/fix it 
in mail threads before 'dc:author' ends up getting mentioned in books etc.

cheers,

Dan
> :x sameWorkAs :y -> safe for author, creation date
> :x sameManifestationAs :y -> safe for the the above, and length (?)
> 
> Does that help?
> 
> Damian
> 
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.6 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> 
> iD8DBQFI4NdRAyLCB+mTtykRAppqAJ9kzkWgcWt0zeWfWdMfWwqtdhoblwCeNCWH
> 54J20+PaNd1xmCmcFLs9DN8=
> =/gW2
> -----END PGP SIGNATURE-----
> 
>

Received on Monday, 29 September 2008 17:09:46 UTC