public string DocumentTypeName {get;}

internal void KnowledgeGraphDocuments(KnowledgeGraph kg)
{
  // use the KnowledgeGraphPropertyInfo
  var propInfo = kg.GetPropertyNameInfo();
  var supportsDocs = propInfo.SupportsDocuments;
  var documentType = propInfo.DocumentTypeName;
  var documentInfo = propInfo.DocumentPropertyInfo;
}

internal async void AddDocumentRecord2()
{

  await QueuedTask.Run(() =>
  {
    using (var kg = GetKnowledgeGraph())
    {

      var propInfo = kg.GetPropertyNameInfo();
      if (!propInfo.SupportsDocuments)
        return false;

      var edit_op = new EditOperation()
      {
        Name = "Create Document Example",
        SelectNewFeatures = true
      };

      var doc_entity_name = propInfo.DocumentTypeName;
      var hasdoc_rel_name = GetHasDocumentTypeName(kg.GetDataModel());

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

      //This is the document to be added...file, image, resource, etc.
      var url = @"E:\Data\Temp\HelloWorld.txt";

      // create the KnowledgeGraphDocumentDescription
      var kgDocDesc = new KnowledgeGraphDocumentDescription(url);

      // if there is a geometry use the following ctor
      // var kgDocDesc = new KnowledgeGraphDocumentDescription(url, doc_location);

      // if you have additional custom attributes 
      //var customDocAtts = new Dictionary<string, object>();
      //customDocAtts.Add("custom_attrib", "Foo");
      //customDocAtts.Add("custom_attrib2", "Bar");
      //var kgDocDesc = new KnowledgeGraphDocumentDescription(url, null, customDocAtts);

      // add additional properties if required
      kgDocDesc.Keywords = @"text,file,example";
      
      /// The Create method will auto-populate the Url, Name, FileExtension and contentType fields of the document row
      /// from the path supplied.  
      var rowToken = edit_op.Create(doc_tbl, kgDocDesc);

      //Get the entity whose document this is...
      var org_fc = kg.OpenDataset<FeatureClass>("Organization");
      var qf = new 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
      }

      // set up the row handles
      var originHandle = new RowHandle(org_fc, origin_org_id);    // entity
      var destinationHandle = new RowHandle(rowToken);            // document

      // create the KnowledgeGraphRelationshipDescription
      var rd = new KnowledgeGraphRelationshipDescription(originHandle, destinationHandle);

      // if you have additional custom attributes for the "HasDocument" relationship
      //var customHasDocAtts = new Dictionary<string, object>();
      //customHasDocAtts.Add("custom_attrib", "Foo");
      //customHasDocAtts.Add("custom_attrib2", "Bar");
      //var rd = new KnowledgeGraphRelationshipDescription(originHandle, destinationHandle, customHasDocAtts);

      // create the relate record using the same edit operation
      edit_op.Create(doc_rel_tbl, rd);

      //Call execute to create all the entities and relationship rows _together_
      return edit_op.Execute();
    }
    return false;
  });
}