From: Rutger V. <R....@re...> - 2011-11-10 09:47:39
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> I agree with Enrico about the importance of annotating data at a given level of detail. It's true that the current, "fully triplified", matrix representation can be quite large as a datastore. But if you think of referencing characters, states, and data cells in a linked data context, you can have URIs which reference any detailed node in a matrix, but actually maps back to some other matrix store implementation (which you probably recognize already). The most fine-grained CDAO content can be used to exchange metadata for given nodes in the matrix graph without instantiating the entire matrix in triples. I am not sure how we could reference all the different pieces of a character matrix with a smaller number of triples, but it would be useful to explore alternatives. Even given that, it seems like it would be useful to include ways to reference compact versions of data elements as suggested by you and Enrico. Great points. Yes, we do want the *ability* to go to a very granular representation of individual matrix cells - especially, perhaps, for morphological matrices - and some way of faking that for the 80% of use cases is something to be explored. Just as long as it's not the only possible way of doing things in CDAO. Not so dissimilar a situation from TreeBASE, where we can imagine individual matrix cells usefully having their own PhyloWS URIs for some use cases, yet we can't really support an ever expanding matrixelement table that has every cell in every matrix ever submitted to TreeBASE as individual records (as we found out). > In your earlier email, you mentioned handling ordering of lists (taxa and characters). I don't think we can use rdf:List within OWL DL - there is an interesting presentation here: > > http://www.co-ode.org/resources/tutorials/bio/slides/owl-lists29_11_05.ppt > > We might be best off with simple character numbers rather than maintaining an actual list data structure, which would just add to our verbosity problem. Ah, ok - I wasn't aware of those issues. Thanks. Best wishes, Rutger -- Dr. Rutger A. Vos School of Biological Sciences Philip Lyle Building, Level 4 University of Reading Reading, RG6 6BX, United Kingdom Tel: +44 (0) 118 378 7535 http://rutgervos.blogspot.com |