Glossary
About
This glossary is to help communication within the NCBO by standardizing the terms we use internally
Many of the terms here are sourced from: Media:SmithCeusters.pdf
Meanings of terms used in NCBO
Levels of Reality:
1 - Physical Reality
2 - Psychological Reality = our knowledge and beliefs about 1.
3 - Propositions, Theories, Texts = formalizations of those ideas and beliefs
Definitions
Entity
anything which exists, including things and processes, functions and qualities, beliefs and actions, documents and software (Levels 1, 2 and 3)
Note that sometimes in software engineering the term "entity" refers solely to a the digital representation itself rather than the thing being represented. Within NCBO we use "entity" to mean anything that exists, but typically for level 1 entities.
Domain
portion of reality that forms the subject-matter of a single science or technology or mode of study.
Representation
an image, idea, map, picture, name or description ... of some entity or entities.
Representational Units
terms, icons, alphanumeric identifiers ... which refer, or are intended to refer, to entities.
Ontology
a representational artifact whose representational units (which may be drawn from a natural or from some formalized language) are intended to represent types in reality and those relations between these types which obtain universally (universally = for all instances)
Application vs Reference Ontology
There is a good summary here:
Reference Ontologies - Application Ontologies: Either/Or or Both/And? Christopher Menzel Texas AM University