Novell EDIRECTORY 8.8 SP3, Руководство администратора, Страница: 50 / 634

50 Novell eDirectory 8.8 Administration Guide
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Š
Number of Address
Š
Address Record
Š
Stream
Represents arbitrary binary information. The Stream syntax provides a way to make an
eDirectory attribute out of a file on a file server. Login scripts and other stream attributes use
this syntax. The data stored in a stream file has no syntax enforcement of any kind. It is
completely arbitrary data, defined by the application that created and uses it.
Š Telephone Number
Used by attributes whose values are telephone numbers. The length of telephone number
strings must be between 1 and 32 characters. Two telephone numbers match when they are of
the same length and their corresponding characters are identical, except that all spaces and
hyphen characters are ignored during comparison.
Š
Time
Used by attributes whose values are unsigned integers and represent time expressed in seconds.
Š
Timestamp
Used by attributes whose values mark the time when a particular event occurred. When a
significant event occurs, an eDirectory server mints a new Timestamp value and associates the
value with the event. Every Timestamp value is unique within an eDirectory partition. This
provides a total ordering of events occurring on all servers holding replicas of a partition.
Š
Typed Name
Used by attributes whose values represent a level and an interval associated with an object.
This syntax names an eDirectory object and attaches two numeric values to it:
Š
Level of the attribute indicative of its priority
Š
Interval representing the number of seconds between certain events or the frequency of the
reference
Š Unknown
Used by attributes whose attribute definition has been deleted from the schema. This syntax
represents strings of binary information.
1.4.3 Understanding Mandatory and Optional Attributes
Every object has a schema class that has been defined for that type of object, and a class is a group
of attributes organized in a meaningful way. Some of these attributes are mandatory and some are
optional.
Mandatory Attributes
A mandatory attribute is one that must be filled in when an object is being created. For example, if a
new user is being created using the User class, which has the employee number as a mandatory
attribute, then the new User object cannot be created without providing the employee number.