SPARQL query - Class and subclass give a class name and namespace
How can i get all the class properties and its sub classes with properties from an RDF datasource using SPARQL query given a class name and namespace? ...
rdf
Is there an RDF ontology for blogs?
I'm setting up a blog, and I'm fascinated by RDF and the idea of the sematic web. I'd like to use RDFa to embed sematic data into my blog. There are several well know semantic web ontologies like FOAF for decribing people, ical for events, geo for places. Is there an ontology for blogs? Something to say "This site is a blog. Foo is a bl...
Versioned RDF store
Let me try rephrasing this: I am looking for a robust RDF store or library with the following features: Named graphs, or some other form of reification. Version tracking (probably at the named graph level). Privacy between groups of users, either at named graph or triple level. Human-readable data input and output, e.g. TriG parser an...
Handling historical calendar dates
What standards and strategies are there for handling historic dates described in older calendar form? The contemporary Gregorian calendar, with different length months, leap years, etc. is relatively easily handled with built-in programming language libraries, or data formats such as ISO8601, RFC3339 and RDF's OWL-Time ontology. Earlier...
When and why is ns0pred used?
Greetings, As I am beginning with RDF building, I came along ns0pred here and there. I am assuming ns means no subject and pred means predicate. Not sure on the zero other then a false boolean value. <rdf:Description rdf:about="http://localhost:8890/dataspace/test3/wiki/testWiki/MyTest"> <ns0pred:label xmlns:ns0pred="http://www.w3....
Semantic stuff (RDF, OWL) on mobile phones - is it possible?
I'm thinking about using semantic (web) technogies like RDF and OWL in an application on mobile devices. Currently I'm targeting android, but I'd also be interested in the possibilities on the iPhone and on J2ME. I would like to use a lib instead of implementing everything from scratch. I know that there are some libraries and framework...
How do I connect (and use content of) an RDF file in Flex?
Hi all, I'm working on a prototype in flex and I need to connect my application to an .RDF file that contains some properties. I need to use and manipulate those properties in a "descriptor file" made in Actionscript. So my question is: how do I connect my flex application to that .RDF file? Thanks, regards David ...
Does a "tag search" method exist working with RDF/XML documents in Flex?
Hi all, I'm working on a RDF file in my application. I loaded it with the URLLoader and I've imported flash.xml.* class in order to manipulate the content of my RDF file. I need to count certain tags ("Description") in an efficient way. The number of the tags I'm searching for is variable and now I'm using a combination of methods first...
Database Schema for Machine Tags?
Machine tags are more precise tags: http://www.flickr.com/groups/api/discuss/72157594497877875. They allow a user to basically tag anything as an object in the format object:property=value Any tips on a rdbms schema that implements this? Just wondering if anyone has already dabbled with this. I imagine the schema is quite similar to imp...
work on a particular RDF file in flex
Hi all, I'm still working on a particular RDF file, but seems that something is not going in the right way for me. The code of my RDF file is the following: <?xml version = '1.0"?> <rdf:RDF xmlns:rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc = "http://purl.org/dc/elements/1.1/" xmlns:dp = "http://www.telemed.uniud.it/d...
Does RDF data instance have RDF Schema embedded in it?
There exists a pre-defined norm for RDF Schema. I was wondering whether RDF data instance does have RDF Schema snippet embedded in it? Something like name of a class which also happens to be the name of a subject/object. ...
RDF Schema generation from RDF data instance
Hi Is anyone aware of some work being done on generating RDF schema for a given RDF data instance ? It would be some thing like coming up with information like classes, their attributes, their associations(hierarchical or peer) with other classes and if possible data types of attributes. It all resembles RDF Schema. My other question i...
SPARQL select RDF:ID
I am trying to select the rdf:ID of an object with sparql (inside Protege) and I cant seem to get the rdf:ID. Has anyone seen this problem. The SPARQL query i am using is: Select * where (?element rdf:id ?id) The following also does not work: Select * where (?element rdfs:label ?id) Took a suggestion, but still this is no go: Select...
What is the semantic web?
I've heard a lot about the semantic web but I'm still not exactly sure what it is. How will it be different to the web we know now? ...
Semantic Web :Tutorial on RDF dev.
I am new to Semantic Web. I want to start working on creating some basic RDF document and publish them to get a feel how it works.I found a lot of information about the concepts,vocabulary etc but I couldn't find any thing related to development as what is the development environment required, what are the tool required. I am from .net b...
Programatically generating assemblies from OWL files with ROWLEX
I have been using the ROWLEX library to handle RDF-s. It is shipped with a designtime GUI tool called OwlGrinder.exe that can generate C# helper classes (.NET assemblies to be exact) from my OWL ontologies. I wonder if anyone knows if I could do the same programatically in runtime. ...
How can ROWLEX be licensed under L-GPL while it uses SemWeb which is GPL?
According to its homepage, the SemWeb library (great library for handling RDF under .NET) is released under GPL. Since the ROWLEX tool is built on SemWeb, ROWLEX supposed to be GPL, too. Still, ROWLEX is claimed to be released under L-GPL. Is this legally correct? ...
OWL Assembly Generation Problem (OWLGrinder)
I am building an assembly from my OWL ontology, but when parsing ontology, it raises an error message at "datatype properties" where a type is declared and some values are given. I've written my ontology using Protege v3.4. For example, one of the datatype properties that raises error is "Language" with the type "string" and values like...
Semantic Search help needed urgently..
Hi, Im trying to create a semantic search using java as a base programming language. My task is to create a search prototype which contains triples namely patients, visits and doctors. If i search with a patient name the result should be the patients name and the the time of visit and the corresponding doctors name. Im going to use trip...
The State of RDF in Ruby
I'm wondering about the current support there is in Ruby for semantic web technologies. Is there good RDF options? It seems that the last surveys done were circa 2007 ( http://paul-classic.stadig.name/2007/10/26/the-state-of-rdf-support-in-ruby-2007/ ). Is Redland's RDF wrappers the best way to go for RDF support - all the other proje...