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ABBREVIATION for petroleum, oil, and lubricants 原油、石油和机油
It matches a P element that is a descendant of an LI; the LI element must be the child of an OL element; the OL element must be a descendant of a DIV.
它匹配一个LI元素的后代P元素；而li必须是OL元素的子元素；而OL元素必须是DIV元素的后代。
The core elements in DITA's topic DTD borrow from HTML and XHTML, using familiar element names like p, ol, ul, and dl within an HTML-like topic structure.
DITA主题DTD的核心元素借自html和XHTML，在类似HTML的主题结构中使用众所周知的元素名如p、ol、ul和dl。
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