--- /dev/null
+<!ELEMENT ls (section*|object*)>
+
+<!ELEMENT section (#PCDATA)>
+
+<!ELEMENT object (ann,types)>
+<!ATTLIST object name CDATA #REQUIRED>
+
+<!ELEMENT ann EMPTY>
+<!ATTLIST ann value (YES|NO) #REQUIRED>
+
+<!ELEMENT types EMPTY>
+<!ATTLIST types value (YES|NO|ANN) #REQUIRED>
+