Ajax Timelines and the Semantic Web

Explore anything that has a time component with a little Timeline Ajax code.

The SPARQL query is shown in Listing 19. The sparql2timeline.xsl can be reused from any of the above examples. The commands also are very similar, as shown in Listing 20. The evolution.html can be copied to filesystem.html and modified to include filesystem.json, and we have a new Timeline.


Using RDF and SPARQL can be a great advantage when creating Timelines for new data sources. The sparql2timeline.xsl file can be reused to convert SPARQL query results to JSON. The two main things required are getting the data into RDF and the SPARQL query itself. I've touched on only some possibilities of SPARQL in this article. With SPARQL, it's easy to ensure that a value in the results matches a regular expression or has some other property, such as being between two dates. Results can come from multiple data sources using the UNION keyword. For example, it is easy to combine any of the above SPARQL queries into a single query to show multiple types of time events on a single Timeline.

Resources for this article: /article/9463.

Ben Martin has been working on filesystems for more than ten years. He is currently working toward a PhD at the University of Wollongong, Australia, combining Semantic Filesystems with Formal Concept Analysis to improve human-filesystem interaction.


White Paper
Linux Management with Red Hat Satellite: Measuring Business Impact and ROI

Linux has become a key foundation for supporting today's rapidly growing IT environments. Linux is being used to deploy business applications and databases, trading on its reputation as a low-cost operating environment. For many IT organizations, Linux is a mainstay for deploying Web servers and has evolved from handling basic file, print, and utility workloads to running mission-critical applications and databases, physically, virtually, and in the cloud. As Linux grows in importance in terms of value to the business, managing Linux environments to high standards of service quality — availability, security, and performance — becomes an essential requirement for business success.

Learn More

Sponsored by Red Hat

White Paper
Private PaaS for the Agile Enterprise

If you already use virtualized infrastructure, you are well on your way to leveraging the power of the cloud. Virtualization offers the promise of limitless resources, but how do you manage that scalability when your DevOps team doesn’t scale? In today’s hypercompetitive markets, fast results can make a difference between leading the pack vs. obsolescence. Organizations need more benefits from cloud computing than just raw resources. They need agility, flexibility, convenience, ROI, and control.

Stackato private Platform-as-a-Service technology from ActiveState extends your private cloud infrastructure by creating a private PaaS to provide on-demand availability, flexibility, control, and ultimately, faster time-to-market for your enterprise.

Learn More

Sponsored by ActiveState