Try to process one graph event, or as few as possible, if more must be read at once. For this method to work, you must have called {@link #begin(InputStream)} or {@link #begin(String)} before. This methodreturn true while there are still events to read.
@return true if there are still events to read, false as soon as the fileis finished.
@throws IOException If an I/O error occurs while reading.
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