But trace imprints found in other fossilised feathers (despite an absence of carbon) may indicate the original presence of melanosomes that have since been lost to oxidation.

而其他羽毛化石(尽管缺乏碳元素)中找到的痕迹，也许能显示已经因氧化而消失的黑色素体的原始存在。

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Of course, the presence of namespaces in the original XML data affects how you must write such "transformational" queries.

当然，原始 XML 数据中存在的名称空间将对如何编写那样的 “转换” 查询造成一定的影响。

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In this case, you use Schematron to determine the presence of certain elements in an XML document, without modifying the original XML schema (see Listing 3).

在本例中，使用Schematron来决定特定元素在XML文档中的存在，无需修改原始的XML模式(参见清单3)。

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