Tags / 16 quotes from 8 sources
#instances
Alistair.cockburn.us | Stop Confusing Use Cases And User Stories
Similar to class and instance
Similar to class and instance. Use case is a template of an event and user story is an occurrence.
An Introduction To Obo Ontologies
Classes model types, not instances
Classes (also called "terms" in this guide) model types of objects or processes in the real world. Note that classes model types, not instances. For example, the Gene Ontology class "mitochondria" models the class of all mitochondria, not any particular mitochondria in some…
Annotationproperty Vs. Dataproperty - Answers
AnnotationProperty versus DatatypeProperty in OWL DL
DatatypeProperty and AnnotationProperty are not the same, especially in OWL (2) DL. In OWL (2) DL, terms defined in an ontology are separated into classes, datatypes, object properties, datatype properties, annotation properties, instances and data values. An ObjectProperty…
Cidoc-crm Version 4.2.4 - Reference Document
Instance of a class
An instance of a class is an item that has the traits that match the criteria of the intension of the class.
The domain and range of a property
The domain is the class for which a property is formally defined. This means that instances of the property are applicable to instances of its domain class. The range is the class that comprises all potential values of a property. That means that instances of the property can…
Instance of a property
An instance of a property is a factual relation between an instance of the domain and an instance of the range of the property that matches the criteria of the intension of the property.
Extension of a class
The extension of a class is the set of all real life instances belonging to the class that fulfil the criteria of its intension. This set is "open" in the sense that it is generally beyond our capabilities to know all instances of a class in the world and indeed that the future…
Subclass, class specialization
A subclass is a class that is a specialization of another class (its superclass). Specialization or the IsA relationship means that: 1. all instances of the subclass are also instances of its superclass, 2. the intension of the subclass extends the intension of its superclass…
The complement of a class in the CRM
The complement of a class A with respect to one of its superclasses B is the set of all instances of B that are not instances of A. Formally, it is the set-theoretic difference of the extension of B minus the extension of A. Compatible extensions of the CRM should not declare…
Property quantifiers are ontological
We use the term property quantifiers for the declaration of the allowed number of instances of a certain property that an instance of its range or domain may have. These declarations are ontological, i.e. they refer to the nature of the real world described and not to our…
From Encyclopedia To Ontology: Toward Dynamic Representation Of The Discipline Of Philosophy
Problem: how to differentiate categories from individuals? a sep-driven approximation..
Another important aspect of ontology design concerns the drawing of a line between categories and individuals. For instance, should connectionism be considered an instance of the category philosophy of articial intelligence, or should it be treated as a subcategory with…
Metaclass (semantic Web) - Wikipedia, The Free Encyclopedia
Punning
In the Semantic Web, a metaclass is a class whose instances are classes. Metaclasses are supported in the ontology language OWL and the data-modeling vocabulary RDFS. Similar to their role in programming languages, metaclasses in Semantic Web languages can have properties…
Rdf Primer
Properties, domains and ranges in RDF Schema
All properties in RDF are described as instances of class rdf:Property. [..] RDF Schema also provides vocabulary for describing how properties and classes are intended to be used together in RDF data. The most important information of this kind is supplied by using the RDF…
Reification can't point to a specific triple
...it is important to note that in the conventional use of reification, the subject of the reification triples is assumed to identify a particular instance of a triple in a particular RDF document, rather than some arbitrary triple having the same subject, predicate, and…
Typing resources with rdf:type
However, example.com will probably offer several different models of tents, as well as multiple instances of other categories of products, such as backpacks, hiking boots, and so on. This idea of things being classified into different kinds or categories is similar to the…
The Code4lib Journal – The Moab Design For Digital Object Versioning
A file manifestation (in the frbr sense)
The Moab Design is based in large part on the concept of a file manifestation (in the FRBR[18] sense of manifestation). In this view, a file’s uniqueness is defined by its bytestream content, which will have a unique signature (= file fixity). Multiple file instances might…