Removes all the elements of the page whose bounding boxes are not physically inside the page.
It filters out only the elements which are inside the bounding boxes described in the page's box property.
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It is a simple filter that checks if all the contents of page.elements for each page are inside the limits of the page described by page.box.
Very high. The boundaries of each page and element however, need to be correctly specified by the extractor.
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