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# XSL-FO Documents * * * ## XSL-FO Documents An XSL-FO document is an XML file containing output information. XSL-FO documents are stored in files with the file extension .fo or .fob. You can also store XSL-FO documents as files with the .xml extension. Doing so can make XSL-FO documents more accessible to XML editors. * * * ## XSL-FO Document Structure The structure of an XSL-FO document is as follows: ## Structure Explanation XSL-FO documents are XML documents, so they must also start with an XML declaration: The `` element is the root element of the XSL-FO document. This root element must also declare the XSL-FO namespace: The `` element contains one or more page templates: Each `` element contains a single page template. Each template must have a unique name (master-name): One or more `` elements can describe the page content. The master-reference attribute uses the same name to reference the simple-page-master template: **Note:** The value "A4" for master-reference does not actually describe a predefined page format. It is merely a name. You can use any name, such as "MyPage", "MyTemplate", etc.