Suppose that you have a bunch of image meta data XML documents.
假定您拥有一些图像元数据XML文档。
Similarly, the image meta data documents have height and width elements, but the application calls for a facet called size, which can easily be derived from the height and width elements.
类似地，这些图像元数据文档还具有高度和宽度元素，但是应用程序调用一个名为size的面，这个面可以从height和width元素轻松得到。
The storage medium includes: image data; and meta information.
存储介质包括：图像数据和元信息。
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