ELEMENT cookbook (recipe+)
ELEMENT recipe (head?, (ingredientList|procedure|para)*) 
ATTLIST recipe serves CDATA #IMPLIED
ELEMENT head (#PCDATA) 
ELEMENT ingredientlist (ingredient+)
ELEMENT ingredient (#PCDATA|food|quantity)* 
ELEMENT procedure (step+) 
ELEMENT food (#PCDATA)
ATTLIST food 
   type  (veg|prot|fat|sugar|flavour|unspec) "unspec"
   calories (high|medium|low|none|unknown) "unknown" 
ELEMENT quantity EMPTY 
ATTLIST quantity value CDATA #REQUIRED
                  units CDATA #IMPLIED
                  exact (Y|N) "N"
ELEMENT para (#PCDATA|food)*
ELEMENT step (#PCDATA|food)*