3.4.3. 定义新属性的策略
您必须将标准属性用于应用程序兼容性和长期维护。您必须搜索默认目录中已存在的属性，并将它们与新对象类一起使用，或检查 Directory Server 架构指南。但是，如果标准模式不包含所有必要的信息，请添加新的属性和新对象类。
例如，一个个人条目可能需要比个人、organizationalPerson 或 inetOrgPerson 对象类默认支持更多的属性。标准目录服务器模式中没有属性来存储生日期。您可以在新的辅助对象类 examplePerson 中创建和设置新属性 dateOfBirth 作为允许的属性：
attributetypes: ( dateofbirth-oid NAME 'dateofbirth' DESC 'For employee birthdays'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 X-ORIGIN 'Example defined')
objectclasses: ( 2.16.840.1.117370.999.1.2.3 NAME 'examplePerson' DESC 'Example Person Object Class'
SUP inetorgPerson MAY (exampleDateOfBirth $ cn) X-ORIGIN 'Example defined')注意
您不能在标准 schema 元素中添加或删除自定义属性。如果目录需要自定义属性，请添加自定义对象类使其包含它们。
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