objectClass inheritance hierarchy as defined in the default schemas of openldap

ldap-objectClass-hierarchy.dot

// generating the content of this file:
// ldapsearch -x -LLL -o ldif-wrap=no -b cn=Subschema -s base '(objectClass=subschema)' + | perl -ne 'print "$2 -> $1;\n" if /\bNAME\s*\x27(\w+)\x27.*?\bSUP\s+(\w+)/' | grep -v '^top ->'
// generating an svg from this file:
// dot -Tsvg ldap-objectClass-hierarchy.dot > ldap-objectClass-hierarchy.svg

digraph "openldap schemas" {

    rankdir = LR;
    overlap = scale;

distinguishedName -> seeAlso;
olcBackend -> olcDatabase;
labeledURI -> olcInclude;
olcDatabase -> olcOverlay;
labeledURI -> olcReferral;
labeledURI -> olcReplica;
labeledURI -> olcUpdateRef;
name -> title;
postalAddress -> registeredAddress;
distinguishedName -> member;
distinguishedName -> owner;
distinguishedName -> roleOccupant;
name -> initials;
name -> generationQualifier;
name -> dmdName;
name -> pseudonym;
name -> ipServiceProtocol;
name -> nisMapName;
olcConfig -> olcGlobal;
olcConfig -> olcSchemaConfig;
olcConfig -> olcBackendConfig;
olcConfig -> olcDatabaseConfig;
olcConfig -> olcOverlayConfig;
olcConfig -> olcIncludeFile;
olcConfig -> olcModuleList;
olcDatabaseConfig -> olcLdifConfig;
olcDatabaseConfig -> olcHdbConfig;
person -> organizationalPerson;
person -> residentialPerson;
applicationEntity -> dSA;
domain -> RFC822localPart;
domain -> dNSDomain;
country -> friendlyCountry;
dsa -> pilotDSA;
organizationalPerson -> inetOrgPerson;

}

This is a drawing of the objectClass inheritance hierarchy as defined in the default schemas of openldap. The content of the dot file is generated by this command:
ldapsearch -x -LLL -o ldif-wrap=no -b cn=Subschema -s base '(objectClass=subschema)' + | perl -ne 'print "$2 -> $1;\n" if /\bNAME\s*\x27(\w+)\x27.*?\bSUP\s+(\w+)/' | grep -v '^top ->'
See http://www.openldap.org/faq/data/cache/1366.html for an explanation.

Then the graphic file is generated by this command:
dot -Tsvg ldap-objectClass-hierarchy.dot > ldap-objectClass-hierarchy.svg
where the dot command comes from the graphviz package.
objectClass without descendants has been removed by the grep command.