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42 Novell eDirectory 8.8 SP7 Troubleshooting Guide

Adding an Optional Attribute to an Existing Object Class

Although adding new schema elements is an acceptable practice, modifying or extending existing

schema elements is usually dangerous. Because every schema element is uniquely identified by an

OID, when you extend a standard schema element, you effectively create a second definition for the

element even though it still uses the original OID. This can cause incompatibility problems.

There are times when it is appropriate to change schema elements. For example, you might need to

extend or modify new schema elements as you refine them during development. Instead of adding

new attributes directly to a class, you should generally use auxiliary classes only to

 Add new attributes to an existing object class.

 Subclass an existing object class.

5.3.3 Adding or Removing Auxiliary Classes

The following sample LDIF file creates two new attributes, creates an auxiliary class with these new

attributes, then adds an

inetOrgPerson

entry with the

auxiliary

class as an object class of the entry

and with values for the

auxiliary

class attributes.

version: 1

# Add an attribute to track a bear’s hair. The attribute is

# multi-valued, uses a case ignore string syntax,

# and has public read rights

# Values may include: long hair, short, curly, straight,

# none, black, and brown

# X-NDS_PUBLIC_READ ’1’ The 1 allows public read,

# 0 denies public read

dn: cn=schema

changetype: modify

add: attributeTypes

attributeTypes: ( 2.16.840.1.113719.1.186.4.10 NAME

’bearHair’ SYNTAX 1.3.6.1.4.1.1466.115.121.1.15

X-NDS_PUBLIC_READ ’1’ )

# add an attribute to store a bear’s picture

dn: cn=schema

changetype: modify

add: attributeTypes

attributeTypes: ( 2.16.840.1.113719.1.186.4.11 NAME

’bearPicture’ SYNTAX 1.3.6.1.4.1.1466.115.121.1.5

SINGLE-VALUE )

# create an Auxiliary class for the bearfeatures

dn: cn=schema

changetype: modify

add: objectclasses

objectclasses: (2.16.840.1.113719.1.186.6.101 NAME

’bearFeatures’ MAY (bearHair $ bearPicture) AUXILIARY)

# now create a user named bobby

dn: cn=bobby,o=bearcave

changetype: add

cn: bobby

sn: bear

givenName: bobby

bearHair: Short

bearHair: Brown

bearHair: Curly

bearPicture:< file:///c:/tmp/alien.jpg

objectClass: top

objectClass: person

objectClass: inetOrgPerson

objectClass: bearFeatures

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