questions about rdf

RDF storage

Has someone experiment RDF storage solution like sesame ? I'm looking for performance review of this kind of solution compared to the traditional database solution. ...

database

performance

rdf

sesame

Examples of using semantic web technologies in real world applications

Are you working on a (probably commercial) product which uses RDF/OWL/SPARQL technologies? If so, can you please describe your product? ...

rdf

semantic-web

Are there any tools to visualize a RDF graph? (please include a screenshot)

I'm looking for a tool that will render a RDF graph in a reasonably useful graphic format. The primary purpose of the graphic format being inclusion into a PowerPoint slide or printing on a large plotter for management review. I am currently using TopBraid Composer which does a reasonably well at visualizing a single entity but doesn't...

What are some good Java RDF libraries.

I'm looking for a light weight java library for dealing with RDF data. It needs to be able to parse and write RDF xml data. Also I would like it to support simple querying of an RDF model. SPARQL would be nice but not required and I don't need an inferencing capabilities. I've used Jena, but it's not very light weight. ...

Visualize Friend of a Friend (foaf) graph

I wrote a script to export twitter friends as foaf rdf description. Now I'm looking for a tool to visualize the friend networks. I tried http://foafscape.berlios.de/ but for 300+ Nodes it is really slow and does a bad job on auto formatting. Any hints for good graph visualization tools? It's ok if they do not support foaf directly, but ...

Tools to enable translation of A-Box ontology data

Does anyone know of any tools capable of defining a declarative mapping from T-Box structures from one ontology to another, which when executed can effect translation of A-Box instance data from one ontology's form to another's? I have recently written such a tool to meet my needs, but I was wondering if I reinvented the wheel. ...

Do you leverage Semantic Web technologies? Why or why not?

I'm interested in understanding why people choose to leverage technology built on the W3C Semantic Web standards. How did you make the decision to use the technology you chose and what does it enable you to do that you identify as being unique to the Semantic Web effort? If you have specifically made the decision not to use Semantic We...

For your semantic web type application, do you use RDF or a proprietary model for the internal representation?

If you've worked on a project that stores data for use with the semantic web, do you use RDF or even OWL as the internal data format or do you have your own data model/ontology that you map to RDF for interoperability? If you use RDF, what are your experiences with implementing various things like cyclical class hierachies? If you do ...

rdf

semantic-web

Do you use Microformats, RDF, Dublin Core or another type of sematic markup?

Do you use any of these technologies? Which ones are current and hence sensible to include in a site? Documentation on any seems to be relatively sparse, and usage of any of them limited, as search engines get better, are they even relevant any more? ...

rdf

semantic-web

microformats

What is the best way to learn about RDF / OWL?

What references offer a good summary/tutorial for using RDF/OWL? There seem to be enough tools (Protege, Topbraid, Jena, etc.) that knowing the syntax of the markup languages is not necessary, but knowing the concepts is, of course, still critical. I'm working through the w3c documents (particularly the RDF Primer) but I'd like to fi...

Object-to-Triple mapping using AllegroGraph RDF store?

My project is building a Java web application on top of the AllegroGraph RDF store. I would like to find a good solution to map between the triples that come out of the store and our domain objects. I have looked into Topaz, an Object/Triple mapping API being developed in the spirit of Hibernate. The trouble is that they don't current...

What is the best PHP lib/class to generate RSS/Atom

Hello, I have to produce RSS/Atom feed in various applications, and I want to know a good lib/class wich is able to produce both, and which already handle all common problems. For example the one I used for year does not put the right format for date, so my feed is not well handled by several aggregators. Thanks, Cédric Update : W...

Source for Flash based RSS1/RSS2/ATOM/RDF reader?

Does anyone know where to find a good, opensource RSS reader in Flash? I see lots that implement RSS or ATOM or RSS2, but none that do all of the different RSS style formats out there. I'd prefer to keep this in Flash, as I'm trying to keep this so it'll run with minimal server requirements... Requirements: - Parses RSS1/RSS2/ATOM/RDF, ...

Blending RDF and ORM approaches

I'm working on a team investigating a technology stack for a green-field systems integration project. Part of our favored technology stack use Hibernate to persist its internal state and exposes hooks into the Hibernate transactions so that business entities stay synchronized with the state of this utility. Great, except we need to maint...

What is a good RDF library for .net?

I'm looking for a library that can deal with RDF and OWL data. So far I have found: semweb (no owl support for all I know) rowlex (more of a 'browser' application) Your recommendations: LinqToRdf (very interesting, thanks mark!) ...

Can anyone help me convert this ANTLR 2.0 grammar file to ANTLR 3.0 syntax?

I've converted the 'easy' parts (fragment, @header and @member declerations etc.), but since I'm new to Antlr I have a really hard time converting the Tree statements etc. I use the following migration guide. The grammar file can be found here.... Below you can find some examples where I run into problems: For instance, I have prob...

parsing

antlr

rdf

Storage transactions in Redland's Python bindings?

I've currently skimming through the Python-bindings for Redland and haven't found a clean way to do transactions on the storage engine via it. I found some model-transactions within the low-level Redland module: import RDF, Redland storage = RDF.Storage(...) model = RDF.Model(storage) Redland.librdf_model_transaction_start(model._model...