Upgrade Domino LDAP Schema from version 5.0 to 6.5.2

I have upgraded  domino LDAP from version 5 to Version 6.5.2 but on our schema, we had a difference. In schema version 5, we have objectclass like "company" or "site", which we don't have in schema version 6.5.2.
When I send an LDAP Request with this objectclass, I obtain only some attributs but not all the attributs I want.
When I try to create the objectclass "company", I can't
How can I create an objectclass in schema version 6.5.2 ?
Is there a lot of difference from theses 2 versions ?
sysresaAsked:
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SysExpertCommented:
I would check the Notes Designer and also the C API for R5 and R6 for a comparison.

There have been some changes.

see

http://www-128.ibm.com/developerworks/views/lotus/library.jsp

and

http://publib-b.boulder.ibm.com/portals/Lotus
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