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In addition to type-specific properties, all knowledge types share the following extra properties:
- type: a global type variable that distinguishes between data types
- author: the creator of the document
- date: the date the object was created
- concept1: the left-hand side concept of the relation
- concept2: the right-hand side concept of the relation
- relation: the relation between the two
- weight: the weight of the relationship
- category: a namespace for having different types of relations
Possible relations are:
- is-a: a concept having a more specific meaning than another, e.g. "chihuahua is-a dog" (hyponym)
- is-part-of: a concept that, when combined with other pieces, make up the whole, e.g. "sister is-part-of family" (hyponym)
- is-opposite-of: a concept that has the opposite meaning of another one, e.g. "black is-opposite-of white" (antonym)
- is-property-of: a concept that is entirely linked to another concept, e.g. "sharp is-property-of ice"
- is-related-to: a general relationship, for when other relationships are inappropriate, e.g. "dirty is-related-to rat"
- is-same-as: a concept that is equal to another concept, e.g. "bug is-same-as insect" (synonym)
- concept: the concept that is to be analysised
- perceptonyms: a list of words linked to the described concept