\ontology#book{
	\struct#book[root=true]
		\field
			\childRef[ref=section]
			\childRef[ref=paragraph]
	\struct#section
		\primitive#title[type=string,subtree=true]
			\syntax
				\open{==}
				\close{==}
		\field
			\childRef[ref=paragraph]
	\struct#paragraph[transparent=true]
		\syntax
			\close{\paragraph}
		\field
			\childRef[ref=text]
			\childRef[ref=code]
			\childRef[ref=speech]
			\childRef[ref=thought]
	\struct#code
		\syntax
			\open{`}
			\close{`}
		\field
			\childRef[ref=text]
	\struct#speech
		\syntax
			\open{<<}
			\close{>>}
		\fieldRef[ref=paragraph.$default]
	\struct#text[transparent=true]
		\primitive[type=string]
	\struct#thought
		\syntax
			\short{--}
}