<!ELEMENT Participants (Name, Location, Description) >
<!ELEMENT Name (First, Last) >
<!ELEMENT First (#PCDATA)>
<!ELEMENT Last (#PCDATA)>
<!ELEMENT Location (City, State) >
<!ELEMENT City (#PCDATA)>
<!ELEMENT State (#PCDATA)>

<!ENTITY  source-text "Bela">
<!ENTITY Bela-description SYSTEM "e:Bela.txt">


<!ENTITY  source-text "Makeda">
<!ENTITY Makeda-description SYSTEM "e:Makeda.txt">