如果只知道属性值的一些特定部分，那么使用contains (attribute,value)定位元素。
If only certain parts of attribute value are known, use contains (attribute, value) to locate the elements.
XPath是用于在XML文档中寻找信息的语言，因此它可以用于通过XML文档的元素和属性定位。
XPath is a language for finding information in an XML document, so it can be used to navigate through elements and attributes in an XML document.
left和top属性根据元素与页面左上角的相对位置定位元素。
The left and top attributes position the element with respect to the upper-left corner of the page.
clear属性的行为基本上就是对定位被浮动元素的规则的修改。
The behavior of the clear property is in essence a modification of the rules for positioning a floated element.
然后简要介绍了最终成型的元数据方案，包括对方案性质的定位、方案的组成、方案的属性元素集、置标方案及著录规则等内容；
Secondly, we explain the whole metadata profile, including the functions, documents, elements in the metadata profile, metadata encoding schema and the rules for cataloging.
然后简要介绍了最终成型的元数据方案，包括对方案性质的定位、方案的组成、方案的属性元素集、置标方案及著录规则等内容；
Secondly, we explain the whole metadata profile, including the functions, documents, elements in the metadata profile, metadata encoding schema and the rules for cataloging.
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