算法很简单，它对树的顶级项目进行迭代，并将其文本内容与搜索字符串进行比较(清单6中的第43 - 52行)。
The algorithm is simple; it iterates through the top-level items of the tree and compares their text contents with the search string (lines 43 to 52 in listing 6).
它增加了许多令人兴奋的便利层api，包括文本导航API。用户可以通过它们操作文本、图像和表格特性，还可以轻松地搜索和替换文本内容。
It adds many exciting convenience layer APIs, including the text navigation API, with which users are able to manipulate the text, image, table features and easily search and replace text content.
另外，还可以根据内容(图像上叠加的文本)搜索这些文档；在作为文本显示时，可以选择和复制文本文档。
In addition, there is also a possibility to search these documents based on the content (in the superimposed text), and when displayed as a text, the text document can be selected and copied.
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