Practical Python Artificial Intelligence Programming by Mark Watson

Author:Mark Watson
Language: eng
Format: epub, pdf

Note that I split one RDF statement across three lines (3-5) but this could have been on one line. The RDF statement on lines 3-5 is legal and will be handled correctly by RDF parsers. Here we just represent the date as a string. We can add a type to the object representing a specific date:

1 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . 2 @prefix kb: <http://knowledgebooks.com/ontology#> . 3 4 <http://news.com/201234/> 5 kb:datePublished 6 "2008-05-11"^^xsd:date .

Furthermore, if we do not have dates for all news articles, that is often acceptable because when constructing SPARQL queries you can match optional patterns. If for example you are looking up articles on a specific subject then some results may have a publication date attached to the results for that article and some might not. In practice RDF supports types and we would use a date type as seen in the last example, not a string. However, in designing the example programs for this chapter I decided to simplify our representation of URIs and often use string literals as simple Java strings.

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