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When using DatabaseCodedVocabulary, either the string "none" or an SQL query of the form "SELECT code, subcode FROM table" in which code and subcode, both non-null integers, are vocabulary codes. If a query is specified, the returned rows define a directed graph of codes, and the graph is used to recursively augment the term-code associations established by term_code_query above. Specifically, if term T is associated with code C, and if S is a subcode of C, then T is also associated with S.

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