raadjoe / knowledge-data-vu

Tutorials and Assignments for the Knowledge & Data course @ Vrije Universiteit

Knowledge & Data - Vrije Universiteit

Tutorials and Assignments for the Knowledge & Data course @ Vrije Universiteit.

Based on the work of Rinke Hoekstra and Klaas de Graaf in the previous repository.

Objectives

The objective of the Knowledge and Data course is to make students acquainted with methods and technologies used for expressing knowledge and data, in particular published on the Web. At the end of this course, you will have built an intelligent Web application that queries and reasons over knowledge integrated from various sources obtained from the Web. All this will be based on formal logical theory.

In this course you will study formalisms that are useful and necessary to represent knowledge and data, in particular when this knowledge and data is to be reused, e.g. published on the web. We introduce the Semantic Web stack, a set of technologies and representation formats (RDF, RDFS, OWL) for expressing semantics and linked data in a web-accessible format, use the SPARQL query language to query over this data, and build a Web application that uses the data for some intelligent task.

Support

The course is taught by Victor de Boer ([email protected]), Joe Raad ([email protected]) and Stefan Schlobach ([email protected]). Please contact us if you have any questions regarding the course setup. For content questions, we use Piazza. For bugs found in this repository please create a new issue in this repository.

knowledge-data-vu's Issues

Give the regular expression in SW-Application/main.js a global flag

On line 10 in main.js the .replace() function uses a regular expression. The current expression looks for the first occurrence of a # and is then satisfied. However, it can occur that a student has multiple instances of # that have to be encoded. E.g. when using both rdf and rdfs in a query.

This gives a confusing error such as Virtuoso 37000 Error SP030: SPARQL compiler, line 1: Missing <namespace-iri-string> in PREFIX declaration at '<' before 'http:' even though the query seems fine and runs in any other external interface such as Yasgui.

See question 335 on Piazza to see a relevant occurrence of this problem.

A very simple fix could be giving the expression a global flag. Replace /#/ with /#/g and that will fix this specific problem. I'm assuming this repository is not the actual source of your storage for the current and upcoming years. So I'm simply opening an issue instead of a PR.