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goodrelations

Dear all:

When you create GoodRelations data in RDF/XML syntax from existing Web 
applications, there is a potential pitfall:

Your data may contain HTML entity names that are fine for a browser but 
will result in invalid XML,
because not every HTML entity is also a valid XML entity.

Example: The text "£ 100" for 100 GBP may be encoded in HTML as "£ 
100".

However, "£ 100" is not a valid literal value in RDF/XML 
documents, e.g. the following element breaks the XML code:

<rdfs:comment 
rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Coverage from 
£1,000 up to a limit of £5,000</rdfs:comment>

Luckily, it's relatively easy to avoid that problem:

Option 1: Use the numeric entity encoding (£) instead of the entity 
name (£). This will work for both HTML and RDF/XML.

Option 2: Use the UTF-8 character "£" directly instead of with HTML 
entity names.

You may have to update data in the source database in both cases.

This will mostly be a problem when augmenting older, HTML 4.x-based 
applications or data sources originating from those.

Thanks to Andreas Radinger for spotting this problem!

Best wishes

Martin Hepp

-- 
--------------------------------------------------------------
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

This is the archive of the goodrelations dicussion list

[goodrelations] Pitfall when creating GoodRelations data: HTML entity names in XML