---
title: top
description: The top-level object class, which is the abstract parent of all structural object class hierarchies.
component: pingds
version: 8.1
page_id: pingds:schemaref:oc-top
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/oc-top.html
---

# top

The top-level object class, which is the abstract parent of all structural object class hierarchies.

|                       |                                                           |
| --------------------- | --------------------------------------------------------- |
| *OID*                 | 2.5.6.0                                                   |
| *Names*               | top                                                       |
| *Class type*          | ABSTRACT: for use when defining other object classes.     |
| *Required attributes* | [objectClass](at-objectClass.html)                        |
| *Origin*              | [RFC 4512](https://datatracker.ietf.org/doc/html/rfc4512) |
| *Schema file*         | 00-core.ldif                                              |