From Wiki of the E-Business and Web Science Research Group

GoodRelations is a standardized vocabulary for product, price, and company data that can be embedded into existing static and dynamic Web pages.
Project Main Page Vocabulary Documentation Developer's Wiki GoodRelations Cookbook

This page describes a simple demo of using public product master data from the data set at

• http://openean.kaufkauf.net/id/

via the LOD Virtuoso repository at

• http://lod.openlinksw.com/sparql

via a simple Python script.

Video

Click here for the video: http://www.ebusiness-unibw.org/mhepp/SemanticPOS2.mov

Code

 
# Semantic Web Cash Register
# martin hepp, May 25, 2009
 
 
import urllib
import simplejson
 
print 'UniBW Munich Semantic Web-powered Point-Of-Sale'
print 'Written by the E-Business & Web Science Research Group'
 
total=0
 
def fetchLabel(EanUpc):
        query = "SELECT ?label WHERE {?uri rdf:type <http://purl.org/goodrelations/v1#ProductOrServiceModel>."+\
        "?uri <http://purl.org/goodrelations/v1#hasEAN_UCC-13> \""+EanUpc+\
        "\"^^<http://www.w3.org/2001/XMLSchema#string>. ?uri rdfs:label ?label}"
        params = urllib.urlencode({'default-graph-uri': '', 'query': query,
       'format': 'application/sparql-results+json', 'debug' : 'on', 'timeout' : ''})
        f = urllib.urlopen("http://lod.openlinksw.com/sparql?%s" % params)
 
        results = simplejson.load(f)
        results = results['results']
        results = results['bindings']
        results = results[0]
        results = results['label']
        results = results['value']
        return results
 
while True:
    ean=raw_input('Enter EAN or scan item')  # fetch EAN from keyboard
    if (ean==''): break             # stop when input is empty
    ean ="0"+ean 
    print ean                       # print EAN
    productname = fetchLabel(ean)   # get label from the Semantic Web
    price = 1.99                    # get price per unit
    print productname, price        # show product name and price
    total=total+price               # add product price to bill
 
print 'Thanks for shopping with us. The total is', total