Axis-aligned bounds in canonical page points (1/72 inch).
OptionalconfidenceOCR confidence in [0,1] when supplied; native text has no recognition confidence.
OptionalfontNative PDF font identifier when available; not a claim that the font is installed.
OptionalfontNative text size in canonical page points when available.
OptionalimageSource embedded appearance for regional OCR, when applicable.
OptionalquadOptional four-corner geometry in canonical page points.
Whether the span came from the PDF text layer or OCR.
Text content of the native run or OCR word.
A native text run or recognized OCR word with geometry and explicit provenance.