Adding attributes in LDAP

Hi everyone,
I want to add thse new attributes in my ldap user accounts,
date of birth
sex
qualification,
nationality.
I went to some attribute lists I could find, but I couldn't find these attributes.
Can any one help me?

If you want to add ldap attributes to your directory, you do so by 'extending the schema'. That is, defining new objectTypes (or adding definitions to existing ones) that contain the attributes you want. You can do this either by finding an objectType schema that fits your needs, or, making your own.

Your first step (after determining what additional attributes you want, which you've done) is to see if there's an objectType already on the server that adds these attributes. If not, look for a schema extension that someone has already created for storing these values. For instance, the eduPerson schema - http://middleware.internet2.edu/eduperson/ - has lots of attributes useful to educational institutions. You can add it to your ldap server by including the attribute definitions in your ldap server startup files.
If you can't find an existing schema extention, you'll need to define your own.

Sorry for the late reply. But I am still having problems to define schemas in LDAP. If I could ask a question, what are OIDs? And do I really need them to define schemas or extend existing schema?
I have tried simply typing new attributes in existing schemas such as inetorgperson.schema but it didn't work & I assume it is because I don't have a OID registered to my name or my companie's.

http://lmgtfy.com/?q=create+ldap+oid

I just need to know what option I have if I can not register for a OID.