以下为引用内容:
the reason I decided to go forward with OML, is that as the number of applications using an outline XML format increase, with the current extension mechanism in place, it is going to be very difficult for these applications to interoperate. Not only is there nothing that specifies the names of the most common attributes, but the fact that there can be any number of varying attributes in the outline element, is in the opinion of many, a big problem.

Hence, OML is less attribute-oriented than OPML, and instead uses a number of well-defined outline-attributes, text, created, etc, but also differs form OPML in using two important data-bearing elements, data and item.

from Browsing with OPML

oml(Outline Markup Language) 与 opml(Outline

Processor Markup Language) 类似，导出 xml 格式的链接列表。格式如下：

oml

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foaf格式

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del.icio.us 现在导出的是htm，原因是大多数浏览器都支持这样的导入。

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BTW:opera community si so cool

[Edit on 2005-11-15 23:23:17 By guoshuang]