Den OPML attributes. This namespace defines attributes only; they appear on standard OPML outline elements to preserve Den channel and folder settings across export and import. Documentation: https://den.io/xml/opml Boolean restricted to lowercase "true"/"false". The numeric forms "1"/"0" permitted by xs:boolean are not recognized by Den's importer. SF Symbols name for a folder outline's icon, e.g. "globe.americas". Defaults to "folder" when absent. Disables content blocklists for the channel's viewer. Defaults to "false". Disables JavaScript in the channel's viewer. Defaults to "false". Enables machine-generated preview summaries for the channel's articles. Defaults to "false". Preferred article presentation for the channel. When absent, Den chooses automatically. Maximum number of articles kept per fetch. Values outside the range are clamped on import. Defaults to 10. Article retention period in days. Values outside the range are clamped on import. Defaults to 30. Minimum time between feed refreshes, in minutes. Negative values are clamped to 0 on import. Target language for automatic article translation, as a BCP 47 language code, e.g. "en". Absent when translation is off. Manual source-language override for the channel, as a BCP 47 language code, e.g. "de". Used when a feed misreports its language.