>The full URI should be what you use to determine if two Resources are the >same. Namespace/localpart are just syntactic convenience - the code keeps and >indexes URIs only.
Not comparing two nodes. >For literals, you need to test the language or datatype as well. No issue with literals. >"123" is not the integer 123. > >You can use .equals (of RDFNode, the supertype of Resource and Literal) Not comparing two nodes. >A Resource is a URI or a blank node. Correct. Not interested in anonymous node's namespace. However, very much interested in a given URIresource's namespace (when it makes sense) and/or URIresource's localname. > Because "410069.jpeg" is illegal as an XML qname local part, it is not > returned by Jena. So basically, a Jena API user interested in a node's NS and name will need to extract the full URI and parse it manually to extract the NS and the Name. Because the com.hp.hpl.jena.rdf.model.Resource.getNameSpace() will potentially return invalid namespaces (if the name starts with a numeral or contains a dot). Being able to navigate every statement in an RDF graph is one of the reasons we are considering JENA, where can we add a feature request for this API? Thanks. Another example is Woodrow Wilson's congress people entry. <foaf:Person rdf:about="http://www.rdfabout.com/rdf/usgov/congress/people/412360";> ... </foaf:Person> Jena represents the statement like this: [http://www.rdfabout.com/rdf/usgov/congress/people/412360, http://www.w3.org/1999/02/22-rdf-syntax-ns#type, http://xmlns.com/foaf/0.1/Person] But the Subjec'ts namespaces is reported as "http://www.rdfabout.com/rdf/usgov/congress/people/412360"; and it's localname as "". Thanks, Rodrigo. -----Original Message----- From: Andy Seaborne [mailto:[email protected]] Sent: Tuesday, March 26, 2013 8:56 AM To: [email protected] Subject: Re: RDF Model Namespaces On 25/03/13 17:19, Pastrana, Rodrigo (RIS-BCT) wrote: > In order to use Jena's API to navigate RDF graphs, I need to know how > this particular node is represented. If the node were a literal, its > literallexicalform would be sufficient. Since the node is represented > as an instance of "Resource" the node's label is the namespace + the > localname. However, "http://www.govtrack.us/data/photos/410069."; Is > clearly not a NS, and "jpeg" is not its local name. > > Using Jena's API how can one determine if the given "Resource" node > can represented by its literallexicalform, or by its > namespace+localname. Thanks. The full URI should be what you use to determine if two Resources are the same. Namespace/localpart are just syntactic convenience - the code keeps and indexes URIs only. For literals, you need to test the language or datatype as well. "123" is not the integer 123. You can use .equals (of RDFNode, the supertype of Resource and Literal) A Resource is a URI or a blank node. RDFNode has isLiteral()/isURIResource()/isResource()/isAnon() for testing what kind of thing an RDFNode is. By XML, ("http://www.govtrack.us/data/photos/410069.","jpeg";) is a qname - in fact the one with the longest local part. This is a qname ("http://www.govtrack.us/data/photos/410069.jp";, "eg") for the same URI. Because "410069.jpeg" is illegal as an XML qname local part, it is not returned by Jena. Roll on Turtle ... Andy ----------------------------------------- The information contained in this e-mail message is intended only for the personal and confidential use of the recipient(s) named above. This message may be an attorney-client communication and/or work product and as such is privileged and confidential. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail, and delete the original message.
