A wiki with structured entries and meaningful links between them.
A semantic wiki is a wiki in which both the entries and the relationships between them can be “typed” with names and associated metadata. A semantic wiki differs from a regular wiki because it allows for implicit knowledge inference and for robust queries using languages like you’d find in a Graph Database. Semantic wikis can be considered a form of Ontology software.
Semantic Wikis would have Entity Definitions, and definitions of Entity Relationship Categories. The relationships between the relationships would also be made explicit. You’d probably be best served having a type of entity titled “relationship”, whose class could be used as edges in the graph. If the relationship categories themselves weren’t pertinent to the knowledge graph, then you could use a URI scheme and reference external repos for the Ontology. This is what the 4th term in RDF quad stores effectively does, I think. Or maybe not. Regardless it seems like it might be a good practice to include the relationships themselves as entities in the wiki. For that matter, you’d probably want constraints. Actually designing a Semantic Wiki might be awesome.
Example pseudo wiki code:
Entity_Name: Living Person
Definition: A human being who was born at some point.
Properties:
Name: string
Birthday: Date
Entity_Name: Dead Person
Extends: [Living Person]
Properties:
Death_Date: Date
Relationship_Name: Family
Label_From: Is family with
Label_To: Is family with
From_Types: [Living Person, Dead Person]
To_Types: [Living Person, Dead Person]
Relationship_Name: Parent
Label_From: Has Child
Label_To: Has Parent
From_Types: [Living Person, Dead Person]
To_Types: [Living Person, Dead Person]
Subtypes: [Family]