ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data.Knowledge Namespace / KnowledgeGraphDataModel Class / GetMetaEntityTypes Method
Example Version

GetMetaEntityTypes Method
Gets a dictionary, with the keys being the names of the meta entity types in the data model, and the values being objects containing information about each meta entity type. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Example
Get Data Model MetaEntityTypes/Provenance
//Provenance entity type is stored as a MetaEntityType 
QueuedTask.Run(() =>
{
  //Create a connection properties
  var kg_props =
      new KnowledgeGraphConnectionProperties(new Uri(url));
  using (var kg = new KnowledgeGraph(kg_props))
  {
    //Get the KnowledgeGraph Data Model
    using (var kg_dm = kg.GetDataModel())
    {
      var dict_types = kg_dm.GetMetaEntityTypes();
      //If there is no provenance then MetaEntityTypes will be
      //an empty collection
      foreach (var kvp in dict_types)
      {
        var meta_entity_type = kvp.Value;
        if (meta_entity_type.GetRole() ==
            KnowledgeGraphNamedObjectTypeRole.Provenance)
        {
          //TODO - use the provenance entity type
          var name = meta_entity_type.GetName();

        }
      }

    }
  }
});
Get Whether KG Supports Provenance
internal string GetProvenanceEntityTypeName(KnowledgeGraphDataModel kg_dm)
{
  var entity_types = kg_dm.GetMetaEntityTypes();
  foreach (var entity_type in entity_types)
  {
    if (entity_type.Value.GetRole() == KnowledgeGraphNamedObjectTypeRole.Provenance)
      return entity_type.Value.GetName();
  }
  return "";
}
internal bool KnowledgeGraphSupportsProvenance(KnowledgeGraph kg)
{
  //if there is a provenance entity type then the KnowledgeGraph
  //supports provenance
  return !string.IsNullOrEmpty(
    GetProvenanceEntityTypeName(kg.GetDataModel()));


  // OR use the KnowledgeGraphPropertyInfo
  var propInfo = kg.GetPropertyNameInfo();
  return propInfo.SupportsProvenance;
}
Get Whether KG Has a Document Type
internal string GetDocumentEntityTypeName(KnowledgeGraphDataModel kg_dm)
{
  var entity_types = kg_dm.GetEntityTypes();
  foreach (var entity_type in entity_types)
  {
    var role = entity_type.Value.GetRole();
    if (role == KnowledgeGraphNamedObjectTypeRole.Document)
      return entity_type.Value.GetName();
  }
  return "";//Unusual - probably Neo4j user-managed
}

internal bool KnowledgeGraphHasDocumentType(KnowledgeGraph kg)
{
  //uncommon for there not to be a document type
  return !string.IsNullOrEmpty(
    GetDocumentEntityTypeName(kg.GetDataModel()));
}
Get All KnowledgeGraph Graph Types
QueuedTask.Run(() =>
{
  //Create a connection properties
  var kg_props =
      new KnowledgeGraphConnectionProperties(new Uri(url));
  using (var kg = new KnowledgeGraph(kg_props))
  {
    //Get the KnowledgeGraph Data Model
    using (var kg_datamodel = kg.GetDataModel())
    {
      var entities = kg_datamodel.GetEntityTypes();
      var relationships = kg_datamodel.GetRelationshipTypes();
      var provenance = kg_datamodel.GetMetaEntityTypes();

      var all_graph_types = new List<KnowledgeGraphNamedObjectType>();
      all_graph_types.AddRange(entities.Values);
      all_graph_types.AddRange(relationships.Values);
      all_graph_types.AddRange(provenance.Values);

      System.Diagnostics.Debug.WriteLine("\r\nGraph Types");

      int c = 0;
      foreach (var graph_type in all_graph_types)
      {
        var type_name = graph_type.GetName();
        var role = graph_type.GetRole().ToString();

        //equivalent to:
        //var fields = featClassDef.GetFields().Select(f => f.Name).ToList();
        //var field_names = string.Join(",", fields);
        var props = graph_type.GetProperties().Select(p => p.Name).ToList();
        var prop_names = string.Join(",", props);

        System.Diagnostics.Debug.WriteLine($"[{c++}]: " +
            $"{type_name}, {role}, {prop_names}");
      }
    }
  }
});
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.2 or higher.
See Also