Hi Thomas, It looks like that you are trying to address the skolemization problem [1]? Blank nodes are considered 'something that not exist' when it comes to URIs and resources. They are simply wrappers for resources and not resources on their own. So, something that doesn't exists can not have materialized context. Of course, there are several approaches based on skolemized blank nodes, but problems similar to your problem in hand must be solved there also with some other consequences.
Regards, Milorad [1] for example see http://answers.semanticweb.com/questions/8336/what-is-skolemization >________________________________ > From: Thomas Marsh <[email protected]> >To: [email protected] >Sent: Thursday, November 28, 2013 12:13 AM >Subject: Re: finding where an anonymous individual came from > > > > >On 11/27/13, 1:44 PM, Joshua TAYLOR wrote: >> On Wed, Nov 27, 2013 at 2:42 PM, Thomas Marsh <[email protected]> wrote: >>> On 11/27/13, 10:55 AM, Joshua TAYLOR wrote: >>>> On Wed, Nov 27, 2013 at 1:27 PM, Thomas Marsh <[email protected]> wrote: >>>>> my problem is that when I get to an anonymous individual, I can't tell >>>>> which >>>>> file it came from, and so I can't tell which namespace to put it into. >>>> What do you mean "put it into a namespace"? It's an anonymous >>>> individual; it doesn't have an IRI. "Namespaces" are just IRI >>>> prefixes used for convenience. If something is anonymous and doesn't >>>> have an IRI, then it has no IRI to abbreviate with a namespace prefix. >>>> >>> yes, that is exactly my problem. my store requires me to state where I am >>> storing everything. I was going to try to use the ontology uri for the file >>> where the anonymous individual was declared as a workaround. the problem >>> is that I can't find where it was declared by the time everything's been >>> read into the model. >> Without some more information about your proprietary store, it's not >> clear what you're trying to do or what requirements it imposes on you. >> "my store requires me to state where I am storing everything." >> Aren't you storing everything in the store? In Jena, blank nodes do >> have AnonIds that you can extract with getId. Maybe you could >> construct an identifier with that? >> > >Thanks for the help with this, and sorry to be unclear. >The relevant requirement is that everything have a namespace. since >anonymous nodes don't have namespaces as such, I'm trying to fake it by >making a new namespace to contain the anonymous individuals. I would >like this to somehow reference the context in which the anon was >declared. I think the best way to do this is by finding a uri for one >of these two things: >1. the namespace of the subject of the assertion that has the blank >node as its object >2. the "default" namespace of the owl file within which the blank node >is declared. > >I am investigating method 2. To that end, I am trying to figure out >the connection between the blank node Jena Resource and the ontology >which it comes from. in other words, I'm trying to find, given an >anonymous individual, which owl-file/ontology it was declared in. is >there a way to do that? > >as an example, if I have an owl file called "foo.owl", and it contains >ontology an ontology called "fooOnt" and a namespace called "fooNS", I >want to use one of these things so that I can build a namespace on my >store into which I can throw all my anonymous individuals. >so, in this example, I'd make a namespace called something like: >foo.owl.data or fooOnt.data or fooNS.data > >I'm a little new to this, so I'm not totally sure which, if any, of >these things I could use, but that's the general idea. >does that make sense? > >-thomas > > > > > > > > > > > > > >
