**7. NavigOWL**

NavigOWL is a graph visualization open-source Java-based tool in web ontology environment. This tool is a very interactive high-performance graph layout in semantic web environment. Here all ontologies are structured based which facilitate the patrons in thinking the mental map in an ontology environment. Protégé can be graphically represented by using this plug-in for better management of link and their elements (http://home.deib.polimi.it/hussain/navigowl/index. html). **Figure 4** represents the NavigOWL interface in web ontology environment. It loads and uploads the RDF/OWL ontology file for creation of graph and taxonomy in different nodes and edges.

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**Figure 5.**

*Unilexicon vocabulary interface in taxonomy (https://unilexicon.com/).*

*Taxonomy and Ontology Management Tools: A General Explanation*

Unilexicon is a visual online controlled vocabulary and thesaurus construction server. This is a high-level open-source software for designing taxonomy and classification. It fully supports the faceted navigation and tagging for document and knowledge classification on the basis of simple knowledge organization system (SKOS). Institutional digital repository can easily be designed and developed by using the metadata and semantic search tool. This is also known as record management tool (https://unilexicon.com/). **Figure 5** represents the Unilexicon vocabulary interface. This is independent of content management system by using tag and facet count

*DOI: http://dx.doi.org/10.5772/intechopen.88606*

**8. Unilexicon vocabulary**

*NavigOWL interface in web ontology.*

concept.

**Figure 4.**

**Figure 4.** *NavigOWL interface in web ontology.*

*Ontological Analyses in Science, Technology and Informatics*

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**7. NavigOWL**

**Figure 3.**

**Figure 2.**

different nodes and edges.

NavigOWL is a graph visualization open-source Java-based tool in web ontology environment. This tool is a very interactive high-performance graph layout in semantic web environment. Here all ontologies are structured based which facilitate the patrons in thinking the mental map in an ontology environment. Protégé can be graphically represented by using this plug-in for better management of link and their elements (http://home.deib.polimi.it/hussain/navigowl/index. html). **Figure 4** represents the NavigOWL interface in web ontology environment. It loads and uploads the RDF/OWL ontology file for creation of graph and taxonomy in

*WebVOWL interface in semantic environment (http://visualdataweb.de/webvowl/).*

*Linked open vocabularies interface in semantic web ontology (https://lov.linkeddata.es/dataset/lov/).*
