public sealed class KnowledgeGraphRelationshipType : KnowledgeGraphNamedObjectType, System.IDisposable  

//Use GetDocumentEntityTypeName(KnowledgeGraphDataModel kg_dm) from
//the 'Get Whether KG Has a Document Type' snippet to
//get the documentNameType parameter
bool HasGeometry(KnowledgeGraphNamedObjectType kg_named_obj)
{
  var props = kg_named_obj.GetProperties();
  return props.Any(prop => prop.FieldType == FieldType.Geometry);
}

{
  await 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.GetRelationshipTypes();

        foreach (var kvp in dict_types)
        {
          var rel_type = kvp.Value;
          var role = rel_type.GetRole();
          //note "name" will be the same name as the corresponding
          //feature class or table in the KG's relational gdb model
          var name = rel_type.GetName();
          //etc.
          //Get relationship end points
          var end_points = rel_type.GetEndPoints();
          foreach (var end_point in end_points)
          {
            System.Diagnostics.Debug.WriteLine(
              $"Origin: '{end_point.GetOriginEntityTypeName()}', " +
              $"Destination: '{end_point.GetDestinationEntityTypeName()}'");
          }
        }

      }
    }
  });
}

{
  var mv = MapView.Active;
  var create_rel1 = await QueuedTask.Run(() =>
  {
    //This example uses a chained edit operation
    var edit_op = new EditOperation()
    {
      Name = "Create entities and a relationship",
      SelectNewFeatures = true
    };

    //We are just going to use the GDB objects in this one but
    //we could equally use feature layers/standalone tables

    //using Feature Class/Tables (works within Investigation or map)
    var org_fc = kg.OpenDataset<FeatureClass>("Organization");
    var person_tbl = kg.OpenDataset<Table>("Person");
    //Relationship table
    var emp_tbl = kg.OpenDataset<Table>("HasEmployee");

    var attribs = new Dictionary<string, object>();

    //New Organization
    attribs["Name"] = "Acme Ltd.";
    attribs["Description"] = "Specializes in household items";
    attribs["SHAPE"] = mv.Extent.Center;//whatever is its location

    //Add it to the operation - we need the rowtoken
    var rowtoken = edit_op.Create(org_fc, attribs);

    attribs.Clear();//we are going to re-use the dictionary

    //New Person
    attribs["Name"] = "Bob";
    attribs["Age"] = "41";
    attribs["Skills"] = "Plumbing, Framing, Flooring";

    //Add it to the operation
    var rowtoken2 = edit_op.Create(person_tbl, attribs);

    attribs.Clear();

    //At this point we must execute the create of the entities
    if (edit_op.Execute())
    {
      //if we are here, the create of the entities was successful

      //Next, "chain" a second create for the relationship - this ensures that
      //Both creates (entities _and_ relation) will be -undone- together if needed
      //....in other words they will behave as if they are a -single- transaction
      var edit_op_rel = edit_op.CreateChainedOperation();

      //we need the names of the origin and destination relation properties
      var kg_prop_info = kg.GetPropertyNameInfo();
      //use the row tokens we held on to from the entity creates
      attribs[kg_prop_info.OriginIDPropertyName] = rowtoken.GlobalID;
      attribs[kg_prop_info.DestinationIDPropertyName] = rowtoken2.GlobalID;

      //Add any extra attribute information for the relation as needed
      attribs["StartDate"] = new DateTimeOffset(DateTime.Now);

      //Do the create of the relate
      edit_op_rel.Create(emp_tbl, attribs);
      return edit_op_rel.Execute();
    }
    return false;//Create of entities failed
  });
}

{
  var mv = MapView.Active;
  var createRel = await QueuedTask.Run(() =>
  {
    //This example uses a KnowledgeGraphRelationshipDescription
    var edit_op = new EditOperation()
    {
      Name = "Create entities and a relationship using a KG relate desc",
      SelectNewFeatures = true
    };

    //We are just going to use mapmembers in this example
    //we could equally use feature classes/tables
    var kg_layer = mv.Map.GetLayersAsFlattenedList()?
                  .OfType<ArcGIS.Desktop.Mapping.KnowledgeGraphLayer>().First();
    //From the KG Layer get the relevant child feature layer(s) and/or standalone
    //table(s)
    var org_fl = kg_layer.GetLayersAsFlattenedList().OfType<FeatureLayer>()
                    .First(child_layer => child_layer.Name == "Organization");

    var person_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "Person");

    var rel_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "HasEmployee");

    var attribs = new Dictionary<string, object>();

    //New Organization
    attribs["Name"] = "Acme Ltd.";
    attribs["Description"] = "Specializes in household items";
    attribs["SHAPE"] = mv.Extent.Center;//whatever is its location

    //Add it to the operation - we need the rowtoken
    var rowtoken_org = edit_op.Create(org_fl, attribs);

    attribs.Clear();//we are going to re-use the dictionary

    //New Person
    attribs["Name"] = "Bob";
    attribs["Age"] = "41";
    attribs["Skills"] = "Plumbing, Framing, Flooring";

    //Add it to the operation
    var rowtoken_person = edit_op.Create(person_stbl, attribs);

    attribs.Clear();

    //Create the new relationship using a KnowledgeGraphRelationshipDescription
    //Row handles act as the placeholders for the TO BE created new entities that will
    //be related
    var src_row_handle = new RowHandle(rowtoken_org);
    var dest_row_handle = new RowHandle(rowtoken_person);

    //Add any extra attribute information for the relation as needed
    attribs["StartDate"] = new DateTimeOffset(DateTime.Now);

    var rel_desc = new KnowledgeGraphRelationshipDescription(
                                src_row_handle, dest_row_handle, attribs);

    //Add the relate description to the edit operation
    edit_op.Create(rel_stbl, rel_desc);

    //Execute the create of the entities and relationship
    return edit_op.Execute();
  });
}

{
  var ok = await QueuedTask.Run(() =>
  {
    using (var kg_for_doc = kgLayer.GetDatastore())
    {
      var edit_op = new EditOperation()
      {
        Name = "Create Document Example",
        SelectNewFeatures = true
      };

      var doc_entity_name = GetDocumentTypeName(kg_for_doc.GetDataModel());
      if (string.IsNullOrEmpty(doc_entity_name))
        return false;
      var hasdoc_rel_name = GetHasDocumentTypeName(kg_for_doc.GetDataModel());
      if (string.IsNullOrEmpty(hasdoc_rel_name))
        return false;

      //Document can also be FeatureClass
      var doc_tbl = kg_for_doc.OpenDataset<Table>(doc_entity_name);
      var doc_rel_tbl = kg_for_doc.OpenDataset<Table>(hasdoc_rel_name);

      //This is the document to be added...file, image, resource, etc.
      var doc_url = @"E:\Data\Temp\HelloWorld.txt";
      var text = System.IO.File.ReadAllText(url);

      //Set document properties
      var attribs = new Dictionary<string, object>();
      attribs["contentType"] = @"text/plain";
      attribs["name"] = System.IO.Path.GetFileName(url);
      attribs["url"] = doc_url;
      //Add geometry if relevant
      //attribs["Shape"] = doc_location;

      //optional
      attribs["fileExtension"] = System.IO.Path.GetExtension(doc_url);
      attribs["text"] = System.IO.File.ReadAllText(doc_url);

      //optional and arbitrary - your choice
      attribs["title"] = System.IO.Path.GetFileNameWithoutExtension(doc_url);
      attribs["keywords"] = @"text,file,example";
      attribs["metadata"] = "";

      //Specify any additional custom attributes added to the document
      //schema by the user as needed....
      //attribs["custom_attrib"] = "Foo";
      //attribs["custom_attrib2"] = "Bar";

      //Get the entity whose document this is...
      var org_fc = kg_for_doc.OpenDataset<FeatureClass>("Organization");
      var qf = new ArcGIS.Core.Data.QueryFilter()
      {
        WhereClause = "name = 'Acme'",
        SubFields = "*"
      };
      var origin_org_id = Guid.Empty;
      using (var rc = org_fc.Search(qf))
      {
        if (!rc.MoveNext())
          return false;
        origin_org_id = rc.Current.GetGlobalID();//For the relate
      }

      //Create the document row/feature
      var rowtoken = edit_op.Create(doc_tbl, attribs);
      if (edit_op.Execute())
      {
        //Create the relationship row
        attribs.Clear();
        //we need the names of the origin and destination relation properties
        var kg_prop_info = kg_for_doc.GetPropertyNameInfo();
        //Specify the origin entity (i.e. the document 'owner') and
        //the document being related to (i.e. the document 'itself')
        attribs[kg_prop_info.OriginIDPropertyName] = origin_org_id;//entity
        attribs[kg_prop_info.DestinationIDPropertyName] = rowtoken.GlobalID;//document

        //Specify any custom attributes added to the has document
        //schema by the user as needed....
        //attribs["custom_attrib"] = "Foo";
        //attribs["custom_attrib2"] = "Bar";

        //"Chain" a second create for the relationship - this ensures that
        //Both creates (doc _and_ "has doc" relation) will be -undone- together if needed
        //....in other words they will behave as if they are a -single- transaction
        var edit_op_rel = edit_op.CreateChainedOperation();
        edit_op_rel.Create(doc_rel_tbl, attribs);
        return edit_op_rel.Execute();
      }
      return false;
    }
  });
}

string GetDocumentTypeName(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 "";
}

string GetHasDocumentTypeName(KnowledgeGraphDataModel kg_dm)
{
  var rel_types = kg_dm.GetRelationshipTypes();
  foreach (var rel_type in rel_types)
  {
    var role = rel_type.Value.GetRole();
    if (role == KnowledgeGraphNamedObjectTypeRole.Document)
      return rel_type.Value.GetName();
  }
  return "";
}

{
  var mv = MapView.Active;
  await QueuedTask.Run(() =>
  {
    var edit_op = new EditOperation()
    {
      Name = "Delete an Entity record"
    };

    //We are  going to use mapmembers in this example
    //we could equally use feature classes/tables
    var kg_layer = mv.Map.GetLayersAsFlattenedList()?
                  .OfType<ArcGIS.Desktop.Mapping.KnowledgeGraphLayer>().First();
    //Entity
    var org_fl = kg_layer.GetLayersAsFlattenedList().OfType<FeatureLayer>()
                    .First(child_layer => child_layer.Name == "Organization");

    //Get the entity feature(s) to delete
    long org_oid = -1;
    var qf = new ArcGIS.Core.Data.QueryFilter()
    {
      WhereClause = "name = 'Acme'",
      SubFields = "*"
    };
    using (var rc = org_fl.Search(qf))
    {
      if (!rc.MoveNext())
        return;//nothing to delete
      org_oid = rc.Current.GetObjectID();
    }

    edit_op.Delete(org_fl, org_oid);
    edit_op.Execute();//Do the delete
  });
}

{
  var mv = MapView.Active;
  await QueuedTask.Run(() =>
  {
    var edit_op = new EditOperation()
    {
      Name = "Delete a Relationship record"
    };

    //We are  going to use mapmembers in this example
    //we could equally use feature classes/tables
    var kg_layer = mv.Map.GetLayersAsFlattenedList()?
                  .OfType<ArcGIS.Desktop.Mapping.KnowledgeGraphLayer>().First();
    //Relationship
    var rel_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "HasEmployee");

    //Get the relation row to delete
    long rel_oid = -1;
    using (var rc = rel_stbl.Search())
    {
      if (!rc.MoveNext())
        return;
      //arbitrarily, in this example, get the first row
      rel_oid = rc.Current.GetObjectID();
    }

    edit_op.Delete(rel_stbl, rel_oid);
    edit_op.Execute();//Do the delete
  });
}

{
  var mv = MapView.Active;
  await QueuedTask.Run(() =>
  {

    var edit_op = new EditOperation()
    {
      Name = "Delete a Relationship record"
    };

    //We are  going to use mapmembers in this example
    //we could equally use feature classes/tables
    var kg_layer = mv.Map.GetLayersAsFlattenedList()?
                  .OfType<ArcGIS.Desktop.Mapping.KnowledgeGraphLayer>().First();

    //entities
    var entityOrg = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "Organization");
    var entityPerson = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "Person");

    //Relationship
    var rel_stbl = kg_layer.GetStandaloneTablesAsFlattenedList()
                    .First(child_layer => child_layer.Name == "HasEmployee");

    // get the origin, destination records
    Guid guidOrigin = Guid.Empty;
    Guid guidDestination = Guid.Empty;
    using (var rc = entityOrg.Search())
    {
      if (rc.MoveNext())
        //Use the KnowledgeGraphPropertyInfo to avoid hardcoding...
        guidOrigin = rc.Current.GetGlobalID();
    }
    using (var rc = entityPerson.Search())
    {
      if (rc.MoveNext())
        //Use the KnowledgeGraphPropertyInfo to avoid hardcoding...
        guidDestination = rc.Current.GetGlobalID();
    }

    var rd = new KnowledgeGraphRelationshipDescription(guidOrigin, guidDestination);
    edit_op.Delete(rel_stbl, rd);
    edit_op.Execute();//Do the delete
  });
}