Direktiva attributeType definuje nové typy atributů. Její syntaxe je posána v RFC2252

attributeType <RFC2252 Attribute Type Description>

kde Attribute Type Description je definován následujícím BNF:

AttributeTypeDescription = "(" whsp
        numericoid whsp                 ; AttributeType identifier
      [ "NAME" qdescrs ]                ; name used in AttributeType
      [ "DESC" qdstring ]               ; popis — description
      [ "OBSOLETE" whsp ]
      [ "SUP" woid ]                    ; odvozeno z atributu woid
      [ "EQUALITY" woid ]               ; Matching Rule Name
      [ "ORDERING" woid ]               ; Matching Rule Name
      [ "SUBSTR" woid ]                 ; Matching Rule Name
      [ "SYNTAX" whsp noidlen whsp ]    ; viz Podporované syntaxe
      [ "SINGLE-VALUE" whsp ]           ; default multi-valued
      [ "COLLECTIVE" whsp ]             ; default not collective
      [ "NO-USER-MODIFICATION" whsp ]   ; default user modifiable
      [ "USAGE" whsp AttributeUsage ]   ; default userApplications
      whsp ")"

AttributeUsage =
        "userApplications"      /
        "directoryOperation"    /
        "distributedOperation"  / ; DSA-shared
        "dSAOperation"            ; DSA-specific, value depends on server