A method of collecting training data of a document component may be provided. The documents have a structure and are coded in the typesetting language TeX. The method comprise receiving a TeX source file, compiling it into a PDF file and a related sync file, analyzing the PDF file, thereby determining a non-text-only document component. The method comprises also determining first coordinates of the non-text-only document component and a corresponding page number, determining a typesetting command relating to a non-text-only document component and determining second coordinates of a bounding box and a corresponding page number from the sync file, determining text elements in the non-text-only document component of the PDF file for which the first coordinates and the second coordinates overlap, and combining the determined text elements and linking them to a type of a non-text document component determined in the non-text-only document component in the TeX source file.
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