directives ->
	language-version <1.1>,
	namespace <books>;

books <.rnode> ->

	~ chat GPT <source>,

	by type {comment},
	non-fiction <.nonfiction>,
	cookbooks <.cookbooks>,
	textbooks <.textbooks>,
	reference books <.refbooks>,
	dictionaries <.dict>,
	encyclopedias <.encyclop>,	

	gap {empty},
	novels <.novels>,
	graphic novels <.comics>,
	poetry <.poetry>,
	art books <.artbooks>,
	children's books <.children>,
	religious texts <.religious>,
	

	by genre {nlcomment},
	mathematics <.BXpK2VkK>,
	informatics <.cCf9WCxy>,
	physics <.dvjWV95n>,
	astronomy <.Wv0drMDZ>,
	mechanics <.d9rcknTb>,
	chemistry <.P8QidKj6>,
	biology <.YfqPw0dC>,
	medicine <.cBxHfHcP>,
	psychology <.9GgWVUNz>,
    sociology <.O7XDMKRU>,
	finance <.wzIsl8J5>,
	law <.9MUKBVMy>,
    
    gap {empty},
	fantasy <.nfantasy>,
	science fiction <.nscifi>,
	historical fiction <.nhifi>,
	literary fiction <.lifi>,
	mystery <.nmystery>,
	thriller <.nthril>,
	horror <.nhorror>;