Passport imagery below.
This is FYI. The ICAO scans are from taken from rather complex set of literature ("ICAO Document 9303"--3 volumes...5 parts total). Shown are portions that allow one to get the gist of that DOB, Place of Birth, two-part names are OPTIONAL per UN/ICAO. Also, a 'missing' or 'blank' DOB would show up as <<<<<< in the MRZ.
Even in the RFID-readable data..there DOB and place of birth are OPTIONAL fields.
If the DOB is blank it goes into the MRZ as <<<<<<.
A travel document evidencing lack of DOB, place of birth data, "last name" or nationality can be 100% ICAO compliant.