Hi, I'm hoping someone can help with me with this question about rdflib. Apologies in advance as i'm new to rdflib (and to rdf a bit too) and this might be a newbie question.
I have some code which I am using to construct an rdf sequence. I call 'addItemToSequence' several times to build up the sequence, having set up the graph elsewhere. ns_client_site1_url = "http://example.com/ns/client-site1#"; ns_client_site1 = Namespace(ns_client_site1_url) site = ns_client_site1 def addItemToSequence(source_id, target_id) g.add( (site[source_uid], RDF.Seq, URIRef('children_of_%s' % source_uid) ) ) s = Seq( g, URIRef('children_of_%s' % source_uid) ) g.add( (URIRef('children_of_%s' % source_uid), RDF.li, site[target_uid]) ) I get the following rdf out of it: <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'> <rdf:Description rdf:about="http://example.com/ns/client-site1#124";> <rdf:Seq> <rdf:Description rdf:about="children_of_124"> <rdf:li rdf:resource="http://example.com/ns/client-site1#157"/> <rdf:li rdf:resource="http://example.com/ns/client-site1#151"/> </rdf:Description> </rdf:Seq> </rdf:Description> </rdf:RDF> The intent is to produce the rdf required to describe a simple, hierarchical site map as used by a website, which i can then query. In the example, the resources and target_uid/source_uid represent the unique ids of the pages that are related. Now, my questions are: - have i created a sequence correctly here? i.e. am i _always_ going to get the items back in the same order, or do i just get them back in this order because of a quirk of python/rdflib. i'm not sure how i can test that my sequence is preserving its order. the main reason for doing this is to make sure i'm adding it properly. i was expecting the items in the sequence to have tags of rdf:_1, rdf:_2 etc. - when i add the sequence, it seems i have to give it a name (children_of_whatever). yet i think i ought to be able to specify this as an empty/abstract node (sorry, not quite sure of the terminology here) so I don't need to give it am rdf:description at all. is this possible? or am i misguided?! if it's possible, how do i do it with rdflib. - finally, if i want to change the order of items in the sequence, how should this be done? delete all the items and add them again in the right order? do sequences provide any help to 'promote' items at all? should they? I hope the examples and questions are clear. I've googled quite a lot and whilst rdf examples are easy to find, rdflib examples are not. To that end, I'm happy to contribute a test / example based on the outcome of this (or even some code!) I am using rdflib 2.2.3, as i required python 2.3.5 compatibility. I am using the rdflib.Graph.Graph class and not the sparql graph, if that is any help. rdflib looks really good. is there any chance of getting the rdf and code for the recipe examples in too? happy to hack about with it to get it into shape if it's useful. thanks for your help, miles _______________________________________________ Dev mailing list [email protected] http://rdflib.net/mailman/listinfo/dev
