Directory Proxy Server provides schema validation to ensure that only the allowed data is permitted on write operations. For example, when entries are aggregated using the virtual directory functionality, the aggregate entries might not match the schema of any of the backend servers participating in the entry aggregation. In this case, schema checking can occur on the Directory Proxy Server using a virtual schema.
When schema checking is enabled, Directory Proxy Server retrieves schema available in the cn=schema suffix and uses it to do schema checking. You can define the LDIF data view holding the cn=schema suffix. The content of the cn=schema suffix can point to an LDAP server or to a schema stored in an LDIF file local to the Directory Proxy Server.