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XML format for outlines From Wikipedia, the free encyclopedia
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"[1]). Originally developed by UserLand Software 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.[2]
This article relies largely or entirely on a single source. (May 2017) |
Filename extension | .opml |
---|---|
Internet media type |
application/xml, text/xml, text/x-opml |
Uniform Type Identifier (UTI) | org.opml.opml |
UTI conformation | public.xml |
Developed by | UserLand |
Type of format | Outliner |
Extended from | XML |
Website | dev |
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 importing and exporting RSS feed lists in OPML format is available in Mozilla Thunderbird[3] and in most other RSS reader web sites and applications.[2]
The XML elements in an OPML document are:
<opml version="1.0">
<head>
<body>
<outline>
This article needs additional citations for verification. (December 2013) |
Dave Winer, the founder and CEO of Userland, has made a request for comments on a proposal for validating OPML and released a beta OPML validator.
Katy Ginger[clarification needed] from DLESE[clarification needed] has published an XML Schema Document for validating OPML 2.0. There is also a DTD available for OPML 1.0.
Alternative specifications have been proposed, notably these include OML, XOXO and XBEL.
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