Introduction#

On this page the SparqlVisualization markup is demonstrated via examples based on the Simpsons ontology from the Simpsons Demo

SparqlVisualization Syntax#

Basic Syntax#

For using the SparqlVisualization markup a sparql query with exactly three variables has to be defined. Each triple variable binding of the result set of the query defines one edge of the drawn visualization graph. The first variable value will create the source node, while the third variable value creates the target node. The source and target node will be connected by an edge having the value of variable two. This can be represented by the following pattern:

%%SparqlVisualization
SELECT ?source ?edge ?target WHERE { <selection-pattern>}
%

Annotations#

There's a number of different annotations, which allow to configure different aspects of your SparqlVisualization. Annotations can be placed under any SparqlVisualization markup as following:

%%SparqlVisualization
SELECT ?source ?edge ?target WHERE { <selection-pattern>}
%
@Annotation <option>

---

Demos#

Display the Class Hierarchy as a Tree#

%%SparqlVisualization
     SELECT ?x ?edge ?z WHERE {
	    ?x ?y ?z . 
	    ?x rdfs:subClassOf si:SimpsonsConcept. 
	    ?z rdfs:subClassOf si:SimpsonsConcept. 
	    ?x rdfs:subClassOf ?z.
	    FILTER NOT EXISTS { 
	    	?middleObject rdfs:subClassOf si:SimpsonsConcept. 
	    	?x rdfs:subClassOf ?middleObject. 
	    	?middleObject rdfs:subClassOf ?z.
	    	FILTER (?middleObject != ?x ).
	    	FILTER (?middleObject != ?z ).
 	    }
 	    FILTER (?x != owl:Nothing).
 	     FILTER (?x != ?z).
	    BIND (" " AS ?edge).

}
@rankDir: BT
@size: 700
%

---

Display the family relations as a graph using labels#

One can use the available features of SPARQL to create customized labels for the nodes and edges to generate a more nicely readable visualization.

   SELECT ?xLabel ?yLabel ?zLabel WHERE {
	    ?x ?y ?z . 
	    ?x rdf:type si:Human. 
	    ?z rdf:type si:Human.
	    ?x rdfs:label ?xLabel.
	    ?z rdfs:label ?zLabel.
	    FILTER (?y != si:relatedWith).
	    FILTER (?y != si:parent).
	    FILTER (?y != si:child).
	    FILTER (?y != si:grandparent).
	    FILTER (?z != ?x).
	    BIND (SUBSTR(STR(?y), 33) AS ?yLabel)  
}
@rankDir: BT
@size: 600

---

Visualize lost of stuff (be careful for large ontologies!)#

Note: You can use the option "display svg" from the tool menu on the top right of the visualization to open the diagram in a distinct window. Then you can use browser functions to zoom an navigate the graph.

Colors: The annotation @colors allows to specify a color schema by defining a property. With this property colors can be assigned to Classes and Properties. The color schema for this example can be found on Visualization Util.

%%SparqlVisualization

    SELECT ?x ?y ?z WHERE {
	    ?x ?y ?z . 
	    FILTER (STRSTARTS(STR(?x), "http://www.example.org/ontology#")).
	    FILTER (STRSTARTS(STR(?z), "http://www.example.org/ontology#")).
	    FILTER NOT EXISTS {?x rdf:type rdfs:Class}.
	    FILTER NOT EXISTS {?z rdf:type rdfs:Class}.
	    FILTER NOT EXISTS {?x rdf:type rdf:Property}.
	    FILTER NOT EXISTS {?z rdf:type rdf:Property}.
	    FILTER (?y != si:relatedWith).
	    FILTER (?y != si:parent).
	    FILTER (?y != si:child).
	    FILTER (?y != si:grandparent).
	    FILTER (?z != ?x).

}
@rankDir: BT
@size: 1200
%

---

Show all Properties of the Simpsons Ontology #

%%SparqlVisualization

    SELECT ?x ?y ?z WHERE {
	    ?x ?y ?z . 
	    ?x rdf:type rdf:Property.
	    FILTER (?z != <http://www.w3.org/2000/01/rdf-schema#Resource>). 
	    FILTER (STRSTARTS(STR(?x), "http://www.example.org/ontology#")).
	    FILTER (STRSTARTS(STR(?z), "http://www.example.org/ontology#")).
	    FILTER (?z != ?x).

}
@rankDir: BT
@size: 1200
%

---

Filtering Functions#

To make your SparqlVisualization sleeker, simpler and easier to grasp you can make use of different filtering functions, which are turned on by default (ShowRedundant: false).

ShowRedundant#

This filter is turned on by default and will work on following edges:

• Recursive edges: Edges which have the same subject and object (e.g. Homer is related to himself) will be filtered out.
• Double edges: If there are two edges having same predicate and swapped subject and object, the filtering function will replace them with one double headed edge.
• SuperProperties: The filtering function will focus on the edges having the highest level of detail. Therefore it will find all edges in your visualization having SubProperties in this visualization and filter them out.

Let's visualize all the relations between the characters in the Simpsons ontology to see the difference by turning the redundant filter off first and visualize it afterwards with turned on filter.

ShowRedundant true (Filtering function turned off)#

@size: 1200

ShowRedundant false (Filtering function turned on)#

ShowInverse#

Inverse edges are edges which are the "opposite" of each other (e.g. Husband and Wife).
The filtering function, which is turned on by default (ShowInverse: false), will find these and replace them by one double headed edge having both predicates combined.

ShowInverse true (Filtering function turned off)#

ShowInverse false (Filtering function turned on)#

Visualization Templates#

Visualization Templates can be used to create visualization patterns for certain classes. If a template is defined for a certain class, users will have the option to visualize it on usage, by clicking on the instance in the visualization and chosing "Visualize with template ..."

Defining templates#

Templates are easily defined by using the annotation @isVisTemplateForClass: <class>.
You can also define a default concept which will be visualized when no concept was chosen by using the annotation @templateDefaultConcept: <class>.

Please be aware that only one template should be defined per page!

The example below demonstrates the definition of a SparqlVisualization template for the class si:Human, having si:homer as default concept and will visualize relations between a given si:human instance and other si:human instances.

%%sparqlVisualization
     SELECT ?x ?y ?z WHERE {
	    BIND ( %1$ AS ?x) .
	    ?x ?y ?z . 
	    ?z rdf:type si:Human.
	    FILTER (?z != ?x).
	   }
@templateDefaultConcept: si:homer
@isVisTemplateForClass: si:Human
%

Examples#

Template for class si:Human#

VisualizationTemplateHuman is a template for all instances of class si:Human.

Template for class si:Location#

VisualizationTemplateLocation is a template for all instances of class si:Location.