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Hello,
I submitted yesterday my master thesis about recommendations systems. In this thesis I used concepts from GoodRelations a lot and wanted to share my experience.

First I want to thank Prof. Dr. Martin Hepp for such a great ontology. It reflects nearly all the things that are needed to describe a huge product base and it shows that he has a lot of experiences in ecommerce. It is usable in real world cases. I know that there is some criticism about the complexity of GoodRelations. Actually I was involved in the development of huge online stores with more then 3000 orders a day, multi lingual currency and language, and more then 30 000 products. From this experience I can tell that the data model from GoodRelations is still quite simple and such a complex ontology is necessary to describe data sets of bigger companies.
Feel free to ignore parts of the feedback or to ask questions about certain things.

During my thesis I maintained a small online store for chocolate (see screenshot). The backend of the online store was a Java EE 6 system with a relational MySQL database and the entities were modeled according to the GoodRelations ontology (See attached UML class diagram). So basically I made a mapping of all the things that I needed to UML and then to Java. It was not a 1-to-1 mapping.
I tried some OWL-to-XMI solutions (http://owl2xmi.sourceforge.net/) but I did not succeed. So I made it manually.

I was able to map the whole catalog to the GoodRelations but some smaller things were missing, that I added to my own version:

1. It was not possible to associate a DeliveryMethod or a PaymentMethod directly with the BusinessEntity
2. There was no Order class and no LineItem class

I also didn't found an alignment between the gr:BusinessEntity and the foaf:Organization classes.

Further for recommendation I need more then just a owns attribute for an agent something like, viewed, bought, owns, purchased and so on. (http://apml.areyoupayingattention.com/)

Hope this helps and I hope that this mailing list is the correct place to submit some feedback.

Have a great week
    Manuel

-- 
Manuel Blechschmidt
Hasso-Plattner-Institut
Crailsheimer Str. 10
12247 Berlin
Mobil: 0173/6322621
Twitter: http://twitter.com/Manuel_B

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[goodrelations] Feedback GoodRelations usage for web shop and recommender systems