Semantic Web

Hi everybody,

Drunken Monkey's discussion "RDF for Solr: Possible implementation strategies" leaded to a really interesting discussion about his SoC project. Considering that some of the users involved in that discussion were interested in two projects that I have been working on for few months, I thought that members of this group would be interested in having some more information about both projects.

Fri 19 Jun 2009 - a 2.5-Hr. session starting at 9:00am PDT / 12:00pm EDT / 6:00pm CEST / 5:00pm BST / 16:00 UTC ... a follow-up on one of
the key projects discussed during the recent Ontology Summit 2009. This panel discussion is entitled: "Towards A Quantities and Units of
Measure Ontology-based Standard" - Chair: Dr. Frank Olken (NSF) - Panelists: Mr. Howard Mason (ISO), Dr. Pat Hayes (IHMC), Dr. Robert
Raskin (NASA), Dr. Patrick Cassidy (MICRA), Mr. Dave McComb (Semantic Arts), Dr. Stan Huff (Univ. of Utah), Mr. David Price (Eurostep), Dr.

Well, I don't know if you know about simpleontology module for Drupal 6.x, this module work with concepts, relations, tag and properties, this work with inferences.
The owner of this project is a chinesse student who published his document in chinesse language.
Well this project not is my owner.
This module is available at: http://code.google.com/p/simpleontology/
Pre requisites

• graphviz

There is an error in utils.php file under src directory at line 362, here there is a line with (%s) parameter, this should be ('%s').

(For information about my project, see here. Put shortly, it's about enabling Solr to index RDF data via drupal.)

Before starting the actual coding, even on prototypes, the basic options for implementing this will have to be discussed. At the moment, my mentors and I see the following three possibilities:

Post-graduate fellowship in Semantic Web technologies for Content Management Systems
DERI, National University of Ireland, Galway

The Reasoning and Querying Unit at the Digital Enterprise Research Institute (DERI) of the National University of Ireland, Galway invites applications for a Research Assistant, Masters or PhD fellowship position in the area of Semantic Web technologies for Content Management Systems.

The objectives of the sprint were to flesh out a lightweight basic design for integrating RDF into Drupal core and implement as much as possible the features we agree on during the sprint.

The yearly organized Linking Open Data Triplification Challenge awards prizes to the most promising triplifications of existing Web applications, Websites and data sets.

Contents

• Introduction
• The RDFa Attributes
• The RDF Vocabularies
• Example: A blog post
• RDFa Glossary

I've just hacked together some function skeletons showing some of my ideas for the rdf in core stuff - it's working on top of schema information that modules may return for arbitrary classes, which modules may expose too. Other modules can then alter this information and so change rdf properties / classes associated with it.

Implementation draft: http://drupalbin.com/9322
I've also attached a file containing the draft.

This should allow us to build the token patch on top of it, but also
* it does lazy loading, so there is no need load stuff that isn't need anyway

Three key functions:

From rdf.api.php in the development bzr repository we get definitions for our two hook functions:

<?php
/**
* Allow modules to define their own RDF mappings.
*
* @return
* An associative array of mappings. Most keys will be bundle names, but
* mappings can also be defined for non-bundles.
*/
function hook_rdf_mapping() {
return array(

We're half way through the sprint and we just heard that Google has announced support for RDFa. What a coincidence, surely another sign proving Drupal's heading in the right direction! Now is time for some update on the sprint.

During day 1, we decided to split the group into two in order to enable some parallel developement and to make use of the 2 main skills we had at hand: RDF semantics and Drupal coding.

To become an update for the issue RDFa: Add semantics from the ground up:

UPDATE ON THE UPDATE: This is the approach we think could be taken in contrib for RDF, and the original title Proposal for RDFa in Core, storing and loading, after first day of sprint has been changed. You can see the current approach over here.

Our CRUD functions:
<?php
rdf_mapping_create($bundle, $attribute, $rdf_term);
rdf_mapping_read($bundle, $attribute = NULL);

Project information

Project page on drupal.org: ApacheSolr RDF Support
Student: Thomas Seidl (drunken monkey on d.o)
Mentor: Robert Douglass (robertDouglass)
Co-mentor: Stephane Corlosquet (scor)
Local mentor: Wolfgang Ziegler (fago)

Current status: Implementing first prototype

Description

This project will improve the ApacheSolr module by enabling it to handle (i.e., index and search with a comfortable UI) any kind of RDF data. This will instantly make it possible to provide meaningful searches for all site content that isn't node-centric, as well as content from anywhere else on the web. Only an RDF class description and a way to access the data would have to be provided (apart from the normal Solr requirements) and the module would automatically do the rest of the work.
More information can be found in the original discussion.

There are some interesting proposals to push the Semantic Web in the US Government. The main one is probably Publish recovery data as Linked Open Data proposed by Tim Berners Lee. Recovery.org is already powered by Drupal, and given the coming RDF sprint and RDFa in Drupal 7, this can have a great benefit for Drupal. Please have a look and leave a comment.

There are only a few months left before the code freeze on September 1st. Now that Fields API has settled in core, it's time to extend it with some RDF semantics. DERI Galway is hosting an RDF in Drupal code sprint during the week of May 11th until May 14th.

Goals of the code sprint

The RDF code sprint will focus on Drupal core and aim at integrating RDF semantics in it.

1. Extend Fields API to integrate RDF mappings for each field instance. The semantics of a field can differ from a bundle to another. This can be stored either in the existing settings property or by adding a rdf_mappings property to the Field Instance objects.
2. Modify the Fields UI (contrib) to allow RDF mappings editing.
3. Define the appropriate mappings for the core modules, based on the RDF core mapping proposal.
4. Patch core modules with the mappings defined above.
5. Export these mappings in RDFa via the theme layer and keep it as generic as possible in order to ease the work of the themers.
6. Write tests for RDF in core.
7. Identify other non-fieldable entities in core which could benefit from being RDF-ized, and see how to annotate them. Comment is one example. Terms also, though they might become fieldable.
8. RSS 1 (RDF) in core. Arto volunteered to get started with that.

Hi,

If you live in Vancouver, you might be interested in this new Meetup group:
http://www.meetup.com/The-Vancouver-Semantic-Web-Meetup-Group/

Cheers,
Adrian

Thu 18 Jun 2009 - Dr. Nicola Guarino, President of the "International Association for Ontology and its Applications (IAOA)" and members of the IAOA executive council, will be with us to introduce IAOA, present their views on the role of the association, the future of ontology, and more ...

The new alpha7 release of the RDF module ships with an long list of bug fixes and new features. First of all, it fixes a minor security bug which allowed anonymous users to view the RDF data of unpublished nodes. But that's not the only reason why you will want to update to RDF 1.0-alpha7!

Beside a whole lot of various bug fixes and optimizations, the RDF module now comes with cool and useful end user functionalities. For one you can now have RDF compliant RSS 1.0 feeds which are easy to setup by following the step by step article Arto Bendiken wrote. There is also a nifty option to make your site "RDFa ready" without having to mess around with your theme files. This enables you to embed inline RDFa in the body of your page or use the RDF CCK module along with the RDFa patch for CCK to export your structured data as RDFa. If you like playing with triples, you will also enjoy the autocompleted CURIEs on the Administer » Content management » RDF data » Add statement screen.

Overview

This project is about adding RDF Support to the popular ApacheSolr module in the form of a Solr RDF contrib module. The module should be able to read an RDF class specification and automatically generate the necessary mapping to a Solr server, provide the capability to search resources with that type and also generate facets based on its properties. It would even be possible to build the existing Node search capabilites completely on top of this mechanism! But in any case you could also add arbitrary other types like users or taxonomy terms, or resources from other websites altogether.

I've just posted step-by-step instructions on how to use the Drupal 6.x RDF module to upgrade your Drupal site's RSS feeds for compatibility with RDF and the Semantic Web:

http://ar.to/2009/03/rdfizing-drupal-rss-feeds

As I don't do comments on my site, please feel free to discuss here.

I am looking for some tips on a project I am working on. I have a Drupal 6 site on which I just set up RDF, Apache Solr and OpenCalais. You can see it at http://scis.wju.edu/drupal6.

I imported different vocabularies through evoc: dc, dcterms, dcmitype, foaf, sioc, skos and doap. With these, Calais detects several key concepts within a given post and tags the post accordingly. So, this much is working.

This is the video which was presented during DrupalCon DC 2009 at the Practical Semantic Web and Why You Should Care session.

If I am creating a new site on Drupal 6, how can I better prepare my content for the RDFa features being developed for Drupal 7?

DrupalCon DC 2009 featured a nice selection of RDF related sessions. 2 regular presentations served as introduction to those who were unfamiliar with the topic, or just wanted to refresh their mind with the latest happenings.

Right now there is a issue for getting token into core and one for getting some RDF into it. I wonder if makes sense to base the token patch upon the RDF stuff. So once we have some semantics attached to our objects, we can use them as a starting point for doing the token replacements.

The other way round, the RDF patch could learn from the tokens code - as the actual problem to solve is quite similar. The way the patch in #74 uses simple handlers to get tokens would make sense for RDF too. Then the token implementation can go and build upon that and reuse the handlers returning RDF string literals. Similarly, the approach described in #77 for doing actual token replacements could also be used for getting chunks of RDF for a bunch of objects.

Then apart from avoiding inventing the wheel twice, we could easily make both APIs consistent, so they can be used the same way.

As agreed during the BoF session feel free to add your name, the organization you work for and a few lines about your interests and use case of RDF. You're also welcome to add your name here even if you were not physically present at DrupalCon DC!

I've put together a Surveymonkey poll to make it easier to work out the exact nature of the meetup Stephane announced. If you are interested in this event, please take a minute to indicate your preferences.

Click Here to take survey

Since I don't have a paying account I can't share the results out of the box, but I'll post a pdf report as a follow up.

Update: Sprint scheduled!

DERI Galway would like to host an RDF in Drupal code sprint sometime in May. More and more people are considering using Drupal for their RDF project, so let's get our ideas together and see what can be done to make the semantic web integration in Drupal easier. Please feel free to add your ideas, suggestions, comments, critics.

Hi all,
I am a researcher from DFKI in Germany and we (under leading of Leo Sauermann) are currently working on a project called OrganiK which aims to research and develop a semantic web 2.0 (social, semantic, 2.0) knowledge management system for SMEs.

Hi everybody,

Before I go ahead, let me apologize for being a new comer to the world of semantic web and drupal .. may be some of you might find it funny .. but I have spent the last few hours installing the Drupal Modules relations-6.x-1.0-alpha5 , rdf-6.x-1.0-alpha5 , sparql-6.x-1.0-alpha1 and exhibit-6.x-1.0-alpha2 and reading about semantic web , I have understood the subject - predicate - Object logic .. have designed the RDF logic on paper , created two node types in Drupal ... however I am struggling to establish the relation between them in Drupal.

Reading into the area of semantic web applications, rdf, owl, etc. let me wonder about the lack of information you can get of the current state of development in this area. There doesn't seem to be a wide range of applications using OWL or even RDF. Therefore I'd like to know, what range you use rdf, owl & co for? Especially, how do you/ can imagine to, use Drupal for fürther applications?

My current project

Hi everyone,
I need to show a web page with RDF for my semantic web course... I use RDF (api) module (development version for mappings).
I set up CCK field to map with an ontology and build a page containing this field...
So far it is ok... But, where can I find a RDF/XML output???

I fear I'm grossly misunderstanding core RDF concepts, so I'll just ask a single question and see if there's an actual answer or just better informed questions... : )

Is there an established practice for generating a unique ID for something, like a particular news article that might be syndicated by other sites or a product for sale that might be listed in external shopping/review directories?

Is there a module that achieves personalized recommendations of community content from a users tags against all other users content tags?

So if user A tags a community node with 'drinks', 'entertainment', and 'bar' the resulting recommendation block would push similar tagged content to user A.

I've been reviewing the following modules but still confused

http://drupal.org/project/recommendation

setup for a subscribed friend to friend recommendation???

http://drupal.org/project/cre

only recommends content that has been voted on via VotingAPI.

Onotolog Forum presentation
http://ontolog.cim3.net/file/work/SemanticWiki/SWiki-03_Technology-2_200...

DERI Galway will host the second VoCamp next week. VoCamp is a series of informal events where people can spend some dedicated time creating lightweight vocabularies/ontologies for the Semantic Web/Web of Data. The emphasis of the events is not on creating the perfect ontology in a particular domain, but on creating vocabularies that are good enough for people to start using for publishing data on the Web.

RDFa into Drupal 7 core is on its way! It is now time to start implementing it. We need to agree on a roadmap to help ensure we all head in the same direction before rushing to our keyboards and posting patches on drupal.org. I met up with John and Alexandre from the SIOC project and we came up with the following approach.

What is RDFa?

I'm interested in non-programmer tools that are available to help content creators "mark-up" their content for RDF (Resource Description Framework) discovery. We need good tools to describe free-form content that isn't already fielded in a database.

I am a big fan of FCKeditor (http://drupal.org/project/fckeditor), especially because it is so configurable. You can customize the fckstyles.xml file and add a new style like ...

You are invited to attend Drupal Camp Chicago on October Friday 24 & Saturday 25 2008.

http://drupalcampchicago.org

Who/Why:

For over 2 years Chicago Drupal has truly highlighted the benefits of an open source initiative. We have built resourceful bridges between many local Chicago establishments including non-profits, entrepreneurs, Drupal development companies, independent consultants, hobbyist, and others in the mid-west. Our goal for this Drupal Camp is to bring everyone together for open communication, education, fun, and industry networking.

What:

The update status feed that Drupal.org produces is marked up with the Dublin Core namespace. This is, I suppose, a "good thing", but essentially useless information in the absence of anything else more meaningful. How would we represent this information in an ideal world? What can be done with existing schemas and vocabularies?

Here's a snippet:


<?xml version="1.0" encoding="utf-8"?>