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Definition
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Description OID Syntax Single Valued
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A text statement defining the purpose of this attribute Object Identifier, a unique number identifying this attribute The structure of the grammar used to handle this attribute string Whether this class has one or several values
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In addition to the usual list of syntax definitions (integer, Boolean, OID, and so on), DEN provides special syntax elements in order to fulfill its particular mission Notable among these are DirectoryString and Object DirectoryString is the syntax used to refer to a name taken from a known set of mutually agreed terms, such as the NameFormat set defined for the SystemName property These are base DEN attributes that can be extended by vendors, in much the same way that base DEN classes can be extended
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How DEN Represents Object Relationships
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Information models comprise both data and relationship models, and DEN is no exception As you've seen, the DEN data model's schema is a collection of classes and attributes that directories can use to represent the data characteristics of their content By contrast, DEN's relationship model specifies the relationships among various objects in the schema There are three types of relationships in the DEN information model: Link A relationship between two object instances Association A group of links with a common structure and semantics Aggregation A special type of association in which some objects are "part of" others Let's study some examples to bring this high-concept stuff down to earth Object instances are actual pieces of directory data using a particular object For example, the DEN class UserProfile is used to define what individuals are described to do Persons stored with profiles in a directory each have their own object instance of the UserProfile class These persons might be linked together as part of a domain; that's a link
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It may happen that the directory needs to group a number of DEN links together in order to apply a Kerberos security to them as a unity This is an association, and it definitely beats having to describe security domain by domain
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Sometimes, however, it makes sense to aggregate things For example, an Active Directory might want to publish a global catalog to avoid the inefficiency of publishing complete associations throughout the internetwork The AD could do this by representing the entire associated group as one directory entry That's aggregation
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Relationships, then, are formed within DEN-compliant directories by linking, associating, or aggregating In the mechanical sense, relationships are formed by listing the object to which "this" object relates in the Relationship property field of the base class for the object Table 2-4 shows the format used to represent a DEN relationship
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Table 2-4: Layout of DEN Relationships
DEN Relationship Element
Definition
Purpose Type Cardinality
A statement of the purpose of this relationship The type of this relationship: link, association, or aggregation The relative order of each role within this relationship
Relationships are, of course, what brings any directory system to life Directories (even hierarchical ones) may be flat and dumb compared to relational databases, but they put useful network information together by forming relationships between object entities on a massive scale That, after all, is the very purpose of making directories in the first place: to construct a place where a user, resource, or policy resides Because client/server directories are distributed, they must form and store relationships in order to work At the DEN metadata level, the DEN classes strive to tie all various types of distributed directories together into a single content exchange that uses the above formats as their common currency
DEN Hierarchies
A directory service mapping its data and relationships to the DEN information is of little use in and of itself Profiles and policies are necessary to put this information to work For example, if you wanted to exchange VLAN security policies between a Cisco CDS directory and a directory sitting on a Nortel carrier-class backbone switch, the DEN information infrastructure would make this possible (Nortel is implementing DEN, too) Remember that more advanced network services, QoS in particular, require that policies be applied according to the real-time context of the application Advanced applications such as videocasting and VoIP are all about speed, so there's no time for human intervention This requires that the various directories feed the policy the information it needs to be in synch
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