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OPML (Outline Processor Markup Language) is an XML format for outlines (defined as "a tree, where each node contains a set of named attributes with string values"〔(【引用サイトリンク】title=OPML 2.0 Specification )〕). Originally developed by UserLand as a native file format for the outliner application in its Radio UserLand product, it has since been adopted for other uses, the most common being to exchange lists of web feeds between web feed aggregators. The OPML specification defines an outline as a hierarchical, ordered list of arbitrary elements. The specification is fairly open which makes it suitable for many types of list data. Support for OPML is available in Mozilla Thunderbird, and many other RSS reader web sites and applications can both import and export OPML files of subscriptions. ==XML format== The XML elements in an OPML document are: ; <opml version="1.0">: This is the root element. It must contain the version attribute and one ''head'' and one ''body'' element. ; <head>: Contains metadata. May include any of these optional elements: ''title'', ''dateCreated'', ''dateModified'', ''ownerName'', ''ownerEmail'', ''expansionState'', '' vertScrollState'', ''windowTop'', ''windowLeft'', ''windowBottom'', ''windowRight''. Each element is a simple text element. ''dateCreated'' and ''dateModified'' contents conform to the date-time format specified in RFC 822. ''expansionState'' contains a comma-separated list of line numbers that should be expanded on display. The ''windowXXX'' elements define the position and size of the display window. An OPML processor may ignore all the ''head'' sub-elements. If the outline is opened inside another outline then the processor must ignore the window elements. ; <body>: Contains the content of the outline. Must have at least one ''outline'' element. ; <outline>: Represents a line in the outline. May contain any number of arbitrary attributes. Common attributes include ''text'' and ''type''. The outline element may contain any number of ''outline'' sub-elements. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OPML」の詳細全文を読む スポンサード リンク
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