Lab: Semantic Lifting - XML
Lab 10: Semantic Lifting - XML
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Today's topic involves lifting data in XML format into RDF. XML stands for Extensible Markup Language and is used to... The goal is for you to learn an example of how we can convert unsemantic data into RDF.
import requests import xml.etree.ElementTree as ET
Task 1 Lift the XML data from 'http://feeds.bbci.co.uk/news/rss.xml' about news articles by BBC_News into RDF triples. Do this by parsing the XML using ElementTree (see import above). This means
Parse trough the fictional XML data below and add the correct journalist as the writers of the news_articles from earlier. This means that e.g if the news article is written on a Tuesday, Thomas Smith is the one who wrote it. One way to do this is by checking if any of the days in the "whenWriting" attribute is contained in the news articles "pubDate".
<data> <news_publisher name="BBC News"> <journalist whenWriting="Mon, Tue, Wed" > <firstname>Thomas</firstname> <lastname>Smith</lastname> </journalist> <journalist whenWriting="Thu, Fri" > <firstname>Joseph</firstname> <lastname>Olson</lastname> </journalist> <journalist whenWriting="Sat, Sun" > <firstname>Sophia</firstname> <lastname>Cruise</lastname> </journalist> </news_publisher> </data
If You have more Time
Code to Get Started
from rdflib import Graph, Literal, Namespace, URIRef from rdflib.namespace import RDF, XSD import xml.etree.ElementTree as ET import requests import re g = Graph() ex = Namespace("http://example.org/") prov = Namespace("http://www.w3.org/ns/prov#") g.bind("ex", ex) g.bind("ex", prov) # url of rss feed url = 'http://feeds.bbci.co.uk/news/rss.xml' # creating HTTP response object from given url resp = requests.get(url) # saving the xml file with open('test.xml', 'wb') as f: f.write(resp.content)
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