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Docs: https://www.e-tar.lt/resources/files/TAR_duomenu_mainu_taisykles.pdf ASiC+e: http://www.etsi.org/deliver/etsi_ts/102900_102999/102918/01.03.01_60/ts_102918v010301p.pdf XAdES: http://www.etsi.org/deliver/etsi_ts%5C101900_101999%5C101903%5C01.04.02_60%5Cts_101903v010402p.pdf