<?xml version='1.0' encoding="ISO-8859-1" ?>
<!ELEMENT personen             (person*)>
<!ELEMENT person               (vorname,nachname,photo)>
<!ATTLIST person   persnr      ID #REQUIRED>
<!ATTLIST person   chef        IDREF #IMPLIED>
<!ATTLIST person   geschlecht  (männlich|weiblich) #REQUIRED>
<!ELEMENT vorname              (#PCDATA)>
<!ELEMENT nachname             (#PCDATA)>
<!ELEMENT photo                 EMPTY>
<!ATTLIST photo    src          CDATA #REQUIRED>