<!ATTLIST gui menubar CDATA #IMPLIED>
<!ATTLIST gui toolbar CDATA #IMPLIED>
<!ATTLIST gui statusbar CDATA #IMPLIED>
+<!ATTLIST gui skin CDATA #IMPLIED>
+<!ATTLIST gui fullscreen CDATA #IMPLIED>
<!ELEMENT graphics EMPTY>
<!ATTLIST graphics type CDATA #REQUIRED>
<!ELEMENT vehicle EMPTY>