JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA 3 SEMANTIC WEB AND SOCIAL NETWORKS Previous Question Paper (October/ November - 2020 - R17)

The current web, often referred to as Web 2.0, faces several critical limitations: Lack of machine-understandable content, as data is primarily designed for human consumption; Heterogeneity of data sources, which makes integration difficult; Scalability issues in information retrieval; and Limited automation, requiring human intervention for tasks like data aggregation and reasoning. The Next Generation Web, or the Semantic Web, addresses these by enabling machines to comprehend the meaning of information. It uses standardized formats like RDF and OWL to represent data, allowing software agents to perform complex tasks, discover relationships, and integrate information across diverse applications seamlessly.

The Markup language pyramid represents the hierarchical structure of technologies that enable the Semantic Web, where each layer builds upon the functionality of the one below it. From the foundation to the top, the layers are:

1. XML/Namespaces: The base layer providing a standard syntax for structured documents.
2. RDF (Resource Description Framework): Defines the basic data model for representing resources as subject-predicate-object triples.
3. RDF Schema (RDFS): Provides the vocabulary for defining classes, properties, and hierarchies.
4. Ontology (OWL): Adds complex logic and constraints to define sophisticated relationships and infer new knowledge.
5. Logic/Proof/Trust: The top layers intended for automated reasoning, verification of information, and establishing trust in web content.

This structure ensures that as one moves up the pyramid, the semantic richness and machine-processing capability of the data increase.