This is the archive of the goodrelations dicussion list

Dear all:

If you are developing any kind of GoodRelations-related applications in 
Python, I can recommend very much the combination of the two libraries

- RDFlib [1] for handling RDF in Python and
- SuRF [2] as an object mapper for RDF/OWL entities.

RDFlib provides a nice, "pythonic" framework for parsing, querying, or 
generating RDF data, including support for RDF/XML, RDFa, and Turtle syntax.
SuRF turns RDF nodes and properties into Python classes and instances so 
that you can access them in a clean, straightforward fashion.

See below for an example of loading two company profiles using rdflib 
and SuRF and printing a few key facts to the screen.

SuRF has just added support for the GoodRelations vocabulary, i.e. you 
can now access any GoodRelations element using shortcuts as shown below:

# Define a Python class for the OWL Classes gr:Offering and 
gr:BusinessEntity
Offering = session.get_class(ns.GR['Offering'])
BusinessEntity = session.get_class(ns.GR['BusinessEntity '])

# Get an iterator for all instances of gr:Offering in the graph
all_offers = Offering.all()

# Get an iterator for all instances of gr:Offering in the graph
all_companies = BusinessEntity.all()
for company in all_companies:
    print "Business Entity found: %s " % company.subject
    print  "Legal Name: %s" % company.gr_legalName.first

Thanks to Cosmin Basca for adding GoodRelations support so quickly, and 
to Daniel Krech and all the other RDFlib contributors.


Best wishes

Martin Hepp

[1] http://www.rdflib.net/
[2] http://code.google.com/p/surfrdf/



Complete Example:
--------------------------------
from surf import *

store = Store(  reader='rdflib',
            writer='rdflib',
            rdflib_store = 'IOMemory')

session = Session(store)

# Good Relations Namespace is now predefined in SuRF :-)
# ns.register(gr='http://purl.org/goodrelations/v1#')

print 'Load RDF data'
store.load_triples(source='http://purl.org/goodrelations/v1.owl')
store.load_triples(source='http://www.collibra.com/semanticweb.rdf')
store.load_triples(source='http://www.jarltech.de/semanticweb.rdf')

# Define a Python class for the OWL Classes gr:Offering and 
gr:BusinessEntity
Offering = session.get_class(ns.GR['Offering'])
BusinessEntity = session.get_class(ns.GR['BusinessEntity '])

# Get an iterator for all instances of gr:Offering in the graph
all_offers = Offering.all()

print 'Found %d offers '%(len(all_offers))

for offer in all_offers :
    print "Text: %s" % offer.rdfs_comment.first
    print "URI: %s" % offer.rdfs_seeAlso.first
    print "Eligible regions: ",
    regions = offer.gr_eligibleRegions
    if len(regions) == 0:
        print "None specified"
    else:
        for region in regions:
            print region,
        print
    print   

# Get an iterator for all instances of gr:Offering in the graph
all_companies = BusinessEntity.all()
for company in all_companies:
    print "Business Entity found: %s " % company.subject
    print  "Legal Name: %s" % company.gr_legalName.first



-- 

--------------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

e-mail:  hepp at ebusiness-unibw.org
phone:   +49-(0)89-6004-4217
fax:     +49-(0)89-6004-4620
www:     http://www.unibw.de/ebusiness/ (group)
         http://www.heppnetz.de/ (personal)
skype:   mfhepp 
twitter: mfhepp

Check out GoodRelations for E-Commerce on the Web of Linked Data!
=================================================================

Project page:
http://purl.org/goodrelations/

Resources for developers:
http://www.ebusiness-unibw.org/wiki/GoodRelations

Webcasts:
Overview - http://www.heppnetz.de/projects/goodrelations/webcast/
How-to   - http://vimeo.com/7583816

Recipe for Yahoo SearchMonkey:
http://www.ebusiness-unibw.org/wiki/GoodRelations_and_Yahoo_SearchMonkey

Talk at the Semantic Technology Conference 2009: 
"Semantic Web-based E-Commerce: The GoodRelations Ontology"
http://www.slideshare.net/mhepp/semantic-webbased-ecommerce-the-goodrelations-ontology-1535287

Overview article on Semantic Universe:
http://www.semanticuniverse.com/articles-semantic-web-based-e-commerce-webmasters-get-ready.html

Tutorial materials:
ISWC 2009 Tutorial: The Web of Data for E-Commerce in Brief: A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey 
http://www.ebusiness-unibw.org/wiki/Web_of_Data_for_E-Commerce_Tutorial_ISWC2009