Secondary Source An artifact that is considered to be secondary in a given domain (e.g. a commentary of a primary source wrote by a scholar). Person A human beeing. A concept, often an abstract thing, that is matter of philosophical studies. Rather than precisely define the concept, instances of this classes and of its subclasses are intended as 'topics', e.g. identifying generic aspects or areas in philosophical studies. This class can be extended within particular domains to indicate the concepts thar are of relevance in the domain itself. Relevant Concept A person who produced philosophical contributions or works. Philosopher A thing or person that exists in the real world. Real World Entity An artifact taht is considered to be a primary material in a given domain (e.g. wrote by the author(s) that is(are) matter of study). Primary Source An artifact or document that is matter of study. Source A scholar. Scholar A concept, notion or definition which is relevant to the uderstanding of a philosophical theory or movement. Philosophical Subject Fictional Entity Something or someone that is mentioned within a story, a tale or a fictional artifact in general. Relevant Event An event in time that is considered to be important with respect to a philosophical theory, movement or author. Puts is relation a source with something that it talks about (or in general refers to) both in an implicit and in an explicit way. has subject is part of A source is part of an other source when it is a component of it. For example a chapter can be part of a book, a sentence can be part of an essay, a picture can be part of a page, etc. Puts in relation a specific source with the person who created it. Puts in relation a specific source with a person that is mentioned within the source itself. mentions person Refers to the act of expressing an opinion or point of view, within a source, which is in contrast with an other one expressed in an other source. contradicts quotes Refers to the act of quoting (i.e. making an explicit citation) an other source. has philosophical subject Puts in relation a specific source with a philosophical subject that is discussed in the source itself. Puts in relation a specific source with an other source that is mentioned within the source itself. mentions source agrees with Refers to the act of expressing an opinion or point of view, within a source, which is in accordance with an other one expressed in an other source