Red Hat DIRECTORY SERVER 8.1 - SCHEMA Reference page 24

Chapter 1. About Directory Server Schema
Syntax Method
Postal Address
TelephoneNumber
URI
Table 1.1. LDAP Attribute Syntax
1.1.2.2. Single- and Multi-Valued Attributes
By default, most attributes are multi-valued. This means that an entry can contain the same attribute
multiple times, with different values. For example:
dn: uid=jsmith, ou=marketing, ou=people, dc=example, dc=com
ou: marketing
ou: people
The cn, tel, and objectclass attributes, for example, all can have more than one value. Attributes
that are single-valued — that is, only one instance of the attribute can be specified — are specified
in the schema as only allowing a single value. For example, uidNumber can only have one possible
value, so its schema entry has the term SINGLE-VALUE. If the attribute is multi-valued, there is no
value expression.
4
OID
1.3.6.1.4.1.1466.115.121.1.41
1.3.6.1.4.1.1466.115.121.1.50
Definition
Indicates that values for this
attribute are encoded in the
format postal-address =
dstring* ("$" dstring). For
example:
1234 Main St.$Raleigh, NC
12345$USA
Each dstring component is
encoded as a DirectoryString
value. Backslashes and dollar
characters, if they occur, are
quoted, so that they will not
be mistaken for line delimiters.
Many servers limit the postal
address to 6 lines of up to thirty
characters.
Indicates that values for this
attribute are in the form of
telephone numbers. It is
recommended to use telephone
numbers in international form.
Indicates that the values for
this attribute are in the form
of a URL, introduced by a
string such as http://,
https://, ftp://, ldap://,
and ldaps://. The URI
has the same behavior as
IA5String. See RFC 2396
for more information on this
syntax.