# Data Models This section contains the documentation of the different data models returned by the APIs, detailing the fields and their descriptions. Includes: * **Economic Activities**: Description of economic activity codes (CNAE). * **Cities**: Information about cities, including IBGE codes. * **Establishments**: Data about commercial establishments, such as addresses and registration statuses. * **States**: Details of Brazilian states, with IBGE codes. * **State Registrations**: Information about state registrations associated with CNPJs. * **Suframa**: Documentation about Suframa registrations. * **Error Messages**: List of possible error messages returned by the APIs. * **Legal Natures**: Details about the legal natures of companies. * **Countries**: Information about countries, with BACEN codes. * **Company Sizes**: Descriptions of company sizes (ME, EPP, etc.). * **Corporate Qualifications**: Details about partner qualifications. * **Tax Regimes**: Information about company tax regimes. * **Simples Nacional and MEI**: Data related to Simples Nacional and MEI. * **Registration Statuses**: Details about the registration statuses of companies with the Federal Revenue. * **Partners**: Information about company partners. These documents are essential to understand the types of data that can be queried and received by the APIs. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.cnpj.ws/en/modelos-de-dados.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.