SPARQL / RDF Binding

[william greenly]

Has anyone done any work on looking at a GORM / Datastore for RDF/SPARQL/Triplestore? I have done some work, but want to make sure I am not replicating anything anyone has done.

If people are spending time producing NoSQL solutions I am really hoping they have been looking at the above as a starter.

Many Thanks,

William Greenly

[Mike Hugo-2]

We are doing some work in this space but have mostly been brute forcing things directly into and out of a Sesame RDF repository.  I'd be interested in seeing what you're putting together!

Mike Hugo

Senior Software Engineer

Entagen, LLC

On Mon, Feb 7, 2011 at 3:16 PM, william greenly <[hidden email]> wrote:

Has anyone done any work on looking at a GORM / Datastore for RDF/SPARQL/Triplestore? I have done some work, but want to make sure I am not replicating anything anyone has done.

If people are spending time producing NoSQL solutions I am really hoping they have been looking at the above as a starter.

Many Thanks,

William Greenly

[william greenly]

Mike,

I have done quite a bit around this. One possible solution is to follow suite with the Inconsequential approach. So essentially that encompasses a fully blown GORM for RDF with a SPARQL dialect for persistence related operations. The requirements for such a solution includes the following:

1. Aligning properties in domain classes with RDF properties in Ontologies and Vocabularies.

2. Providing a convention for binding those properties to a Jena Model (Not familiar with the Sesame Libraries, but pretty sure that Jena can plug in to most things)

3. Serialising to and from SPARQL queries read and write from a Triplestore

So in attempting to satisfy those needs, I have defined and developed the following:

1. A JDBC driver for SPARQL. This is completely conformant to the HTTP Based SPARQL 1.1 protocol (non vendor specific) so it should work with an SPARQL compliant triplestore. SPARUL operations are a best fit with the current Working Draft (it does not use SPARUL protocol). This is at beta release (probably a bit aspirational) and can be found below:

http://code.google.com/p/jdbc4sparql/

2. A Groovy to RDF binding. Originally, I didn't envisage having enough time to develop a fully blown GORM (obviously that would infer using Spring Datastore). So the most feasible solution was a pure POGO to RDF binding. This can be found below and is still in construction (75% through construction). Some of the key features include static variable definitions for property mappings, a convention for mappings that don't align gracefully (i.e the domain model differs greatly from the ontology), and a persistence manager for read/write operations. One aspect of its behvoiur is that the RDF model is built at object construction and updated during property changes, not at persistence time, so theoretically one can perform operations on the RDF model independent of the POGO.

http://code.google.com/p/semanticwebpogos/

An assistance on any of the above solutions would be appreciated. Additionally if you (or anyone else) wants to go down the full GORM integration route, I'd be more than willing to contribute.

Many Thanks,

William Greenly

Volkswagen UK Technical Lead

 

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Date: Mon, 7 Feb 2011 15:48:08 -0600
From: [hidden email]
To: [hidden email]
Subject: Re: [grails-user] SPARQL / RDF Binding

We are doing some work in this space but have mostly been brute forcing things directly into and out of a Sesame RDF repository.  I'd be interested in seeing what you're putting together!

Mike Hugo

Senior Software Engineer

Entagen, LLC

On Mon, Feb 7, 2011 at 3:16 PM, william greenly <[hidden email]> wrote:

Has anyone done any work on looking at a GORM / Datastore for RDF/SPARQL/Triplestore? I have done some work, but want to make sure I am not replicating anything anyone has done.

If people are spending time producing NoSQL solutions I am really hoping they have been looking at the above as a starter.

Many Thanks,

William Greenly

[Liam]

Hi,

I might be interested in doing some work on a GORM for RDF/JENA, if there's still some interest in this. The MongoDB/Redis implementations don't seem overly complex as templates to start with.

I also wonder whether some combination of the Grails JPA Plugin + Jenabean (some level of JPA support?) + Jena might be an alternate path?

Regards,

Liam.

[Al Baker]

Also interested in GORM/Jena here.  There is the Empire JPA provider by Clark and Parsia, that I've heard someone had working with Grails (via the gorm-jpa) plugin.

To date I've created SparqlTemplate, much like Spring's JdbcTemplate, and a ModelTemplate for simplifying Jena model manipulation and ARQ API usage.

Any GORM RDF/SPARQL would still have to have a way to annotate the class/properties with their associated URI formats and predicates. 

Perhaps the class could have a URI template, and an annotation on fields to align their predicates.

[Al Baker]

I'm looking at implementing a spring-datastore-jena and grails-datastore-gorm-jena, following the examples of what I see in the various implementations.  I've got the general datastore, session, persister down, but could use some further clarification on the surrounding infrastructure.

Are there any places where some of the key concepts are documented?  Indexer, association, family, association,