It is obvious that not all the pitfalls are equally important; their impact in the ontology will depend on multiple factors. For this reason, each pitfall has an importance level attached indicating how important it is. We have identified three levels:
- Critical : It is crucial to correct the pitfall. Otherwise, it could affect the ontology consistency, reasoning, applicability, etc.
- Important : Though not critical for ontology function, it is important to correct this type of pitfall.
- Minor : It is not really a problem, but by correcting it we will make the ontology nicer.
Results for P37: Ontology not available on the Web. ontology* | Critical
This pitfall occurs when the ontology code (OWL encoding) or its documentation (HTML document) is missing when looking up its URI. This pitfall deals with the first point from the Linked Data star system that states "On the web" ( and ). Guidelines in  also recommends to "Publish your vocabulary on the Web at a stable URI". This pitfall is also related to the problems listed in  and .
*This pitfall applies to the ontology in general instead of specific elements.
Results for P40: Namespace hijacking. 1 case | Critical
It refers to reusing or referring to terms from another namespace that are not defined in such namespace. This is an undesirable situation as no information can be retrieved when looking up those undefined terms. This pitfall is related to the Linked Data publishing guidelines provided in : "Only define new terms in a namespace that you control" and to the guidelines provided in .
• This pitfall appears in the following elements:
• For detecting this pitfall we rely on TripleChecker. See more results at TripleChecker website. Up to now this pitfall is only available for the "Scanner by URI" option.
According to the highest importance level of pitfall found in your ontology the conformace bagde suggested is "Critical pitfalls" (see below). You can use the following HTML code to insert the badge within your ontology documentation:
<p> <a href="http://oops.linkeddata.es"><img src="http://oops.linkeddata.es/resource/image/oops_critical.png" alt="Critical pitfalls were found" height="69.6" width="100" /></a> </p>
-  Aguado-De Cea, G., Montiel-Ponsoda, E., Poveda-Villalón, M., and Giraldo-Pasmin, O.X. (2015). Lexicalizing Ontologies: The issues behind the labels. In Multimodal communication in the 21st century: Professional and academic challenges. 33rd Conference of the Spanish Association of Applied Linguistics (AESLA), XXXIII AESLA.
-  Noy, N. F., McGuinness, D. L., et al. (2001). Ontology development 101: A guide to creating your first ontology.
-  Gómez-Pérez, A. (1999). Evaluation of Taxonomic Knowledge in Ontologies and Knowledge Bases. Proceedings of the Banff Knowledge Acquisition for Knowledge-Based Systems Workshop. Alberta, Canada.
-  Montiel-Ponsoda, E., Vila Suero, D., Villazón-Terrazas, B., Dunsire, G., Escolano Rodríguez, E., Gómez-Pérez, A. (2011). Style guidelines for naming and labeling ontologies in the multilingual web.
-  Vrandecic, D. (2010). Ontology Evaluation. PhD thesis.
-  Gómez-Pérez, A. (2004). Ontology evaluation. In Handbook on ontologies, pages 251-273. Springer.
-  Rector, A., Drummond, N., Horridge, M., Rogers, J., Knublauch, H., Stevens, R., Wang, H., and Wroe, C. (2004). Owl pizzas: Practical experience of teaching owl-dl: Common errors & common patterns. In Engineering Knowledge in the Age of the Semantic Web, pages 63-81. Springer.
-  Hogan, A., Harth, A., Passant, A., Decker, S., and Polleres, A. (2010). Weaving the pedantic web. In Proceedings of the WWW2010 Workshop on Linked Data on the Web, LDOW 2010, Raleigh, USA, April 27, 2010.
-  Archer, P., Goedertier, S., and Loutas, N. (2012). D7. 1.3-study on persistent URIs, with identification of best practices and recommendations on the topic for the Mss and the EC. PwC EU Services.
-  Bernes-Lee Tim. (2006). “Linked Data - Design issues”. http://www.w3.org/DesignIssues/LinkedData.html
-  Heath, T. and Bizer, C. (2011). Linked Data: Evolving the Web into a Global Data Space. Morgan & Claypool, 1st edition.
-  Vatant, B. (2012). Is your linked data vocabulary 5-star?. http://bvatant.blogspot.fr/2012/02/is-your-linked-data-vocabulary-5-star_9588.html
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