\ontology#test
	\struct#test[root=true]
		\field
			\childRef[a]
			\childRef[b]
			\childRef[text]
	\struct#a
		\syntax
			\short[false]{?}
		\primitive[optional=true,type=string]
	\struct#b
		\syntax
			\short[false]{+}
		\field
			\childRef[a]
	\struct#text[transparent=true]
		\primitive[type=string]