<!ELEMENT level (info, rooms, gates, textures)>
<!ELEMENT info (name, desc, start)>
<!ELEMENT rooms (room)*>
<!ELEMENT gates (gate)*>
<!ELEMENT textures (texture)*>
<!ELEMENT name (#PCDATA)>
<!ELEMENT desc (#PCDATA)>
<!ELEMENT start EMPTY>
<!ATTLIST start
x CDATA #REQUIRED
y CDATA #REQUIRED
z CDATA #REQUIRED
>
<!ELEMENT room (floor, (triangle)*)>
<!ATTLIST room
id ID #REQUIRED
<!ELEMENT gate (triangle)*>
<!ATTLIST gate
room1 IDREF #REQUIRED
room2 IDREF #REQUIRED
<!ELEMENT floor (triangle)*>
<!ELEMENT triangle (vertex, normal?, texcoords?, vertex, normal?, texcoords?, vertex, normal?, texcoords?)>
<!ATTLIST triangle
visible (true|false) "true"
texture IDREF #IMPLIED
<!ELEMENT texture EMPTY>
<!ATTLIST texture
name CDATA #REQUIRED
<!ELEMENT vertex EMPTY>
<!ATTLIST vertex
<!ELEMENT normal EMPTY>
<!ATTLIST normal
<!ELEMENT texcoords EMPTY>
<!ATTLIST texcoords
s CDATA #REQUIRED
t CDATA #IMPLIED
r CDATA #IMPLIED
q CDATA #IMPLIED