<!ELEMENT media (dvd|ld)*>
<!ELEMENT dvd (name,rc+,duration,purchase*)>
<!ELEMENT ld (name,duration,purchase*)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT rc (#PCDATA)>
<!ELEMENT duration (#PCDATA)>
<!ELEMENT purchase (place, date?, price?)>
<!ELEMENT place (#PCDATA)>
<!ELEMENT date (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ATTLIST price currency (USD|DEM) #REQUIRED>