classifies : sub_property_of : child_of

Using this relationship, "GroupOfCategories classifies BroaderCategory" states that the subject category is a way (or, is the parent of several ways) in which the members of the BroaderCategory can be divided or grouped. For example "FuelSource classifies Automobile" indicates that groups of items in the Automobile category can be distinguished from each other based on having differed FuelSource-es.

This relationship is used to relate two other relationships to each other. The statement "A is a SubProperty-Of B" says that the relationship A makes a more specific, narrow claim about items it relates than the relationship B does. However, if the system has special behavior or handling for relationship B, the 'SubProperty Of' statement allows it to determine it should apply that special behavior to A as well. For example, when drawing relationship graphs, the system attempts to draw all instances of 'Symmetric Relationship" in a primarily horizontal way. There is a built-in statement that "Peer-Of is a SubProperty-Of Symmetric-Relationship", which causes 'Peer Of' relationships to be (preferentially) drawn horizontally, as will be any other types of relationships that are added to a sontology.

This is the fundamental type of hierarchical relationship. This relationship states that the subject (left-hand side) of the relationship ("A" in the relationship "A is a Child-Of B", and like "spacecraft" in "spacecraft is Child-Of vehicle") is a subset of the object of the relationship ("B" and "vehicle"). When showing a graph of connections between items, the system will attempt to indicate 'Child Of' relationships as primarily vertical, with the object-item drawn nearer "the root" of the graph and the subject-item toward "the leaves". 'Child Of' is typically appropriate for relationships between two categories or between two individuals. To indicate that an individual is contained by a category, the more specific 'One Of' can be used. 'Child Of' is the opposite of 'Parent Of'. Creating a relationship that states one category is 'Child Of' another is exactly the same as creating a 'Parent Of' relationship with the subject and object reversed, and the system will list the relationship between then using both relationship names (which name is given priority depends on which item is more central to the display).