Blockchain technology As you know blockchain technology is a disruptive technology in the current Distributed system has a specific set of characteristics including, Concurrency: each computer in the network executes events independently at the same time as other computers in the network. No common physical clock: there is no single global clock…

Numerical operations using MAX, MIN, COUNT, SUM and AVG keywords. These keywords are executing very basic operations regarding the numerical calculations. But, they can be used for more complex numerical operations in complex queries. They perform exactly the same function which is in the keyword itself. MAX gives the maximum of a given set of integer values. MIN gives minimum…

OPTIONAL, DISTINCT, LIMIT, OFFSET and ORDERBY keywords. Hi all, this is the second part of my SPARQL introduction tutorial. Here I’m going to emphasize on some commonly used keywords in SPARQL. If you are familiar with MYSQL queries you might come across these keywords. Their usage may be exactly same but, use of syntax is bit different…

Nature of a Query. SPARQL stands for SPARQL Protocol and RDF Query Language. SPARQL is a semantic query language for databases — able to retrieve and manipulate data stored in Resource Description Framework (RDF) format. SPARQL queries are represented in triple format.

OWL Properties There are two main types of properties in OWL as Object Properties and Datatype Properties. Apart from this there are types of properties called Annotation Properties.All these types of properties represent relationships.

Named Classes and Disjoint Classes Creating Named Classes We should first go to the classes tab in Protégé window. You can see the “Thing” class which is super class of all the classes. Now we have to create the class hierarchy as we want. There are many ways to create named classes. Using add subclass button and then…

Introduction What is Protégé ? Protégé is a free, open source ontology editor and a knowledge management system. Protégé provides a graphic user interface to define ontologies. It also includes deductive classifiers to validate that models are consistent and to infer new information based on the analysis of an ontology. …