---
title: attributeTypes
description: This operational attribute used in LDAP schema defines attribute types, which specify attributes of directory entries, including their syntaxes and matching rules.
component: pingds
version: 8.1
page_id: pingds:schemaref:at-attributeTypes
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/at-attributeTypes.html
---

# attributeTypes

This operational attribute used in LDAP schema defines attribute types, which specify attributes of directory entries, including their syntaxes and matching rules.

|                             |                                                                                    |
| --------------------------- | ---------------------------------------------------------------------------------- |
| *OID*                       | 2.5.21.5                                                                           |
| *Names*                     | attributeTypes                                                                     |
| *Syntax*                    | [AttributeTypeDescription](s-AttributeTypeDescription.html)                        |
| *Equality matching rule*    | [objectIdentifierFirstComponentMatch](mr-objectIdentifierFirstComponentMatch.html) |
| *Single value*              | false: multiple values allowed                                                     |
| *User modification allowed* | true                                                                               |
| *Usage*                     | directoryOperation                                                                 |
| *Origin*                    | [RFC 4512](https://datatracker.ietf.org/doc/html/rfc4512)                          |
| *Schema file*               | 00-core.ldif                                                                       |
| *Used by*                   | [subschema](oc-subschema.html)                                                     |