How to check local schema

[Bing Jandayran <jlorelyn@ntsp.nec.co.jp>]

 I made a local schema
based on the prototype I'm working on. When I tried to add entries, 
I got this error message:

   ldap_add: Undefined attribute type
                additional info: attribute type undefined.

What could be likes of such error?  How does ones knows if the new
schema conforms to the standards defined in RFC 2252?

A sample entry in my ldif looks like this:
dn: o=ntsp,c=PH
objectclass: organization
o: ntsp

dn:  ProjectDN=Prototype,o=ntsp,c=PH
ProjectDN: Prototype
objectclass: top
objectclass: ProjectProfile (local objectclass)
ProjectName: MMview
ProjectLeader: Tutz

I also found sample schemas wherein new objectclasses and attributes are defined
this way:

dn: cn=schema
changetype: modify
add: attributetypes    #or objectclasses
attributetypes ......

When I tried this,  I got this error:
    ldapadd: invalid format (line 11) entry: "cn=schema"
    ldif_record() = 89

What could have gone wrong?

Thanks!

Lorelyn