This acceptor only allows traversal to shapes that have useful data associated with them, and tries to elide details that aren't useful when analyzing the content of a document.
To use this to render only particular shapes, override it and provide an appropriate implementation of getAcceptor() or accept()
Only visits text nodes, accumulates text content into a string The text is returned in arbitrary order, with no regards to the location of the text on the page.
Used to iterate through shapes To change the behavior of a particular visitor, you can override either accept() or getAcceptor() [preferred] If accept() or visit() throw StopVisitingThisBranch, the iteration will not visit subshapes of the shape.
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