{"id":"municipal_credit_documents","columns":[{"name":"document_year","type":["integer","null"]},{"name":"document_type","type":["string","null"]},{"name":"instrument","type":["string","null"]},{"name":"rating_agency","type":["string","null"]},{"name":"instrument_rating","type":["string","null"]},{"name":"rating_applies_to","type":["string","null"]},{"name":"principal_total","type":["integer","null"]},{"name":"principal_general","type":["integer","null"]},{"name":"principal_water_sewer","type":["integer","null"]},{"name":"amount_status","type":["string","null"]},{"name":"source_page","type":["integer","null"]},{"name":"note","type":["string","null"]},{"name":"source_url","type":["string","null"]}],"empty_values":"CSV empty fields and JSON null mean unavailable; an explicit zero is numeric zero.","source_reference":"Source URL plus page, row, column, or line fields where supplied. Financial columns keep their own budget stages."}