Hi, As far as I know, for "object-oriented data" <-> "semantic data" mapping, Tupelo 2 has done some similar work in 2009/2010. You can have a look at [1] [2]
Best regards, Ying Jiang [1] http://tupeloproject.ncsa.uiuc.edu/node/67 [2] http://tupeloproject.ncsa.uiuc.edu/node/69 On Wed, Mar 19, 2014 at 8:37 PM, Timothy Armstrong <tjarm...@ncsu.edu> wrote: > Hello Andy, > > Thank you so much for your response. I would be very interested in making a > new implementation of DatasetGraph, although I would have to learn about the > issues involved in SPARQL query optimization, as I have not studied those > issues. I would also have to learn more about parallel programming. Well, > maybe it is late to be applying for GSoC. I would just like to get involved > in an open source Semantic Web project, in any case. > > Thank you also for the references to related work. I shall have to look at > them in more detail. I also need to explore the connection with JSON-LD. > > I have had a really large vision about how we can enhance all our > object-oriented technologies with the Semantic Web technologies. Running > SPARQL on object-oriented data is part of it, and I have thought ARQ would > be best for that purpose. Another part is that we can enhance the > object-oriented data model with many elements of the OWL data model, > including much of the reasoning, anywhere the object-oriented data model is > used. The intention is to let people use the OWL data model in all the > object-oriented programs they write, instead of just the object-oriented > data model as it is. > > What I would really like, though, would be if we could get more data on the > Semantic Web and make it larger, with all the object-oriented data in the > world that people are willing to post. I have thought what we really want > to do is set up SPARQL endpoints on object databases. Another source of > object-oriented data in the world is object-relational mapping. I'm not > entirely sure, but I have thought it might also be possible to set up SPARQL > endpoints on data sources of object-relational mapping, by treating the data > as object-oriented data. > > I do have in mind how to implement at least large parts of the functionality > of the Graph, Node, and Triple interfaces backed by object-oriented data, > and I have a lot of code working toward that purpose in Java. My > understanding of ARQ is that it would be sufficient in order to run SPARQL > SELECT, CONSTRUCT, and Update queries on object-oriented data if we would > just implement the Model interface, or related interfaces, backed by > object-oriented data. Is that correct? > > As I have in mind, there would be one implementation of Model for each piece > of object database software, or maybe for each piece of object-relational > mapping software, although the implementations could have a lot of code in > common. There would also be a Model for an arbitrary Java Collection of > Java objects that the user would supply. Additionally, there would be a > Model to use in Java programs that would consist of all the Java objects in > memory that have not been garbage collected, which we could use to run > SPARQL on all the objects in memory. (I have means of accessing main > memory in Java with AspectJ.) > > Well, as I say, maybe it is late to be applying for GSoC. I have just been > hoping that I can make a contribution to the Semantic Web with these ideas. > I need to find a conference to which to submit my article. Thank you very > much again for your response. > > Tim Armstrong > > > > On 03/18/2014 09:49 AM, Andy Seaborne wrote: >> >> Hi Tim, >> >> The idea of this project wasn't to implement the Model interface, it was >> to implement the storage level DatasetGraph interface. Jena has an implement >> for Model in memory (actually - for Graph : Model is a presentation of Graph >> and Graph (and Node and Triple) are the key abstractions. >> >> Aside from GSoC: >> >> Your ideas for relating RDF access to object-oriented sounds interesting - >> do you have a particular source of object-oriented data in mind? >> >> I don't know of any closely related work which isn't to say there isn't >> any. Does the work on CumulusRDF, which stores RDF molecules (if I rmember >> correctly) have any relevance? Or Haystacks (MIT) which used adjacency >> lists on nodes to store RDF which is a different style to the "traditional" >> triple storage style. >> >> I suspect the W3C "CSV on the Web" Working Group might be connected - >> there, data is assumed into be in regular table structures which can be >> viewed as a low level object oriented data format. >> >> Andy >> >> On 18/03/14 01:27, Timothy Armstrong wrote: >>> >>> Hello, >>> >>> I'm interested in contributing to Jena in Google Summer of Code 2014. >>> I'm a computer science Ph.D. student at North Carolina State >>> University. I have studied the Semantic Web very passionately, as I >>> feel it is a wonderful vision. I have taken a course in it, worked as a >>> research assistant on the Protein Ontology project ( >>> http://pir.georgetown.edu/pro/pro.shtml ), and developed some open >>> source software for it. I have used Jena a lot. >>> >>> I have some ideas for JENA-624 ( >>> https://issues.apache.org/jira/browse/JENA-624 ), although I am very >>> interested in directions you see for it, and I would be glad to work on >>> other issues. There are a lot of ideas I have had for my Semantic Web >>> software that are related to Jena. I would be very glad to contribute >>> to the Jena project in GSoC, but I would also be glad to contribute >>> anything in my existing software that would be useful to Jena. Well, I >>> realize that I am a bit late posting here for GSoC, and I am hurrying to >>> get my software's web site and article in a presentable form. >>> >>> I came up with a very simple interpretation of object-oriented >>> programming, similar to connections other people have made, that treats >>> all object-oriented data as triples in RDF. It means in part that we >>> can run SPARQL queries on any object-oriented data. I have thought it >>> would be very good if we could use ARQ to run SPARQL on main memory in >>> object-oriented programs and on object databases. I found that we can >>> post object-oriented data directly on the Semantic Web without having to >>> write any sort of mapping like D2RQ: either by translating >>> object-oriented data into an existing Semantic Web format, or by setting >>> up SPARQL endpoints on object databases. Well, I am very interested if >>> you are aware if any of this has been done before. >>> >>> Regarding JENA-624, I have in mind how to create implementations of the >>> Jena Model interface (com.hp.hpl.jena.rdf.model.Model) backed by Java >>> data. I have been thinking that it might help to run SPARQL on Java >>> data with ARQ if we could implement Model backed by Java data. I am >>> wondering if you think it would be applicable to JENA-624, or to any >>> other issues, if we could create implementations of Model in this >>> manner. There could be both in-memory models with Java data, and disk >>> models with object databases. >>> >>> So, I would be very glad to contribute. >>> >>> Thanks, >>> Tim Armstrong >> >> >
