A visual language for querying and updating graphs
You can see a complicated diagram showing only the top relationships, where each of them is a bundle of links between the individual instances of two classes.Each link is an RDF statement where the subject is an instance of one class, the object is an instance of another class, and the link is the predicate.These databases contain items with a complex structure where the relationships between the components (of the items) have to be maintained. For example, shapes, images (computer vision), XML or OEM data (web exchange data model), molecules and proteins (computational biology), graphical sentences and grammars (visual languages) are represented by graphs.By using graphs the problem of information retrieval on a database is transformed to that of finding subgraphs in a collection of graphs. Although graph-to-graph matching algorithms can be used, efficiency reasons dictate the use of special techniques in order to reduce the search space and the time complexity.GDELT Analysis Service Free cloud-based service that offers a variety of tools and services to allow you to visualize, explore, and export GDELT - a great way to get started using GDELT for the first time.The GDELT Analysis Service is a free cloud-based service that offers a variety of tools and services to allow you to visualize, explore, and export both the GDELT Event Database and the GDELT Global Knowledge Graph.and find an instance of interest through the Easy graph search box or from the Resource view click the Visual Graph button.
NOTE: The Analysis Service currently searches only GDELT 1.0, an upgrade is planned for later this year to integrate all of the GDELT 2.0 datasets.
Given a collection of graphs and a pattern graph, Graph Grep finds all the occurrences of the pattern in each graph.
The pattern is a subgraph and it can be also a tree, a path, or a node.
Depending on the number of links between the instances of two classes, the bundle can be thicker or thinner and gets the colour of the class with more incoming links. In the example below, you can see the relationships between the classes of the News sample dataset provided in the distribution folder.
You can observe that the class with the biggest number of links (the thickest bundle) is pub-old: Document. To control which classes to display in the diagram, use the add/remove icon next to each class.SPARQL is not only a standard query language, but also a protocol for communicating with RDF databases.