# J. 文件取得 PostgreSQL has four primary documentation formats: * Plain text, for pre-installation information * HTML, for on-line browsing and reference * PDF, for printing * man pages, for quick reference. Additionally, a number of plain-text `README` files can be found throughout the PostgreSQL source tree, documenting various implementation issues. HTML documentation and man pages are part of a standard distribution and are installed by default. PDF format documentation is available separately for download. --- # 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.postgresql.tw/16/appendixes/docguide.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.