validate_test

<!DOCTYPE Mailing_list [
<!ELEMENT Mailing_list (EMAIL*)>
<!ELEMENT EMAIL (FROM,(TO|CC),TITLE,TEXT?,ATTACH*,DATE)>
<!ELEMENT FROM (#PCDATA)>
<!ELEMENT TO (#PCDATA)>
<!ELEMENT CC (#PCDATA)>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT TEXT (#PCDATA)>
<!ATTLIST TEXT language (en|bg|ru) #REQUIRED>
<!ATTLIST TEXT format CDATA #IMPLIED>
<!ELEMENT ATTACH (#PCDATA|SIZE)*>
<!ATTLIST ATTACH format CDATA #REQUIRED>
<!ELEMENT SIZE (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
]>