Class Info#

This file captures the class hierarchy and constraints extracted from your ontology, providing the structural metadata needed for KG generation to enforce class relationships and disjointness rules.

On this page:

Structure - Complete field reference
Example - Sample JSON output

Structure#

The file is organized into four main groups: statistics, class lists, hierarchy mappings, and disjointness constraints.

Field	Description
Statistics
`num_classes`	Total number of extracted classes
`hierarchy_depth`	Maximum layer depth in the ontology
`avg_class_depth`	Mean layer index across all classes
`avg_children_per_parent`	Average number of direct subclasses per parent class
`avg_class_disjointness`	Average number of disjoint declarations per class
Class List
`classes`	Sorted list of all extracted class identifiers in `prefix:LocalName` format
Hierarchy Mappings
Direct Hierarchy
`direct_class2subclasses`	Maps each class to its immediate subclasses
`direct_class2superclasses`	Maps each class to its immediate superclasses
Transitive Hierarchy
`transitive_class2subclasses`	Maps each class to all direct and indirect subclasses
`transitive_class2superclasses`	Maps each class to all direct and indirect superclasses (includes the class itself)
Layering
`layer2classes`	Groups classes by layer index (keys become strings in JSON)
`class2layer`	Maps each class to its integer layer depth
Disjointness Mappings
`class2disjoints`	Maps each class to explicitly declared disjoint classes (asserted only)
`class2disjoints_symmetric`	List of symmetric disjoint pairs encoded as `"ClassA-ClassB"`
`class2disjoints_extended`	Maps each class to all classes disjoint by inheritance propagation

Key Details

All class identifiers use prefix:LocalName format from namespaces_info.json
Classes with no matching prefix: _missing:LocalName
transitive_class2superclasses includes each class in its own ancestor set
Integer keys in layer2classes are serialized as JSON strings

Example#

{
  "statistics": {
    "num_classes": 3,
    "hierarchy_depth": 2,
    "avg_class_depth": 1.67,
    "avg_children_per_parent": 1.5,
    "avg_class_disjointness": 0.67
  },
  "classes": [
    "C1",
    "C2",
    "C3"
  ],
  "direct_class2subclasses": {
    "owl:Thing": ["C1", "C3"],
    "C1": ["C2"]
  },
  "direct_class2superclasses": {
    "C1": ["owl:Thing"],
    "C2": ["C1"],
    "C3": ["owl:Thing"]
  },
  "transitive_class2subclasses": {
    "owl:Thing": ["C1", "C2", "C3"],
    "C1": ["C2"]
  },
  "transitive_class2superclasses": {
    "C1": ["C1", "owl:Thing"],
    "C2": ["C2", "C1", "owl:Thing"],
    "C3": ["C3", "owl:Thing"]
  },
  "class2disjoints": {
    "C1": ["C3"]
  },
  "class2disjoints_symmetric": [
    "C1-C3"
  ],
  "class2disjoints_extended": {
    "C1": ["C3"],
    "C2": ["C3"],
    "C3": ["C1", "C2"]
  },
  "layer2classes": {
    "1": ["C1", "C3"],
    "2": ["C2"]
  },
  "class2layer": {
    "C1": 1,
    "C2": 2,
    "C3": 1
  }
}