I should check if there's existing material on Bodhi Puja Gatha. Let me recall: Bodhi Puja is the celebration of the Buddha's enlightenment under the Bodhi tree. Chanting (Gatha) is usually a part of Buddhist rituals. So the PDF could be a guide or script for performing the puja, including chants, which is being presented as part of a lifestyle (meditation, mindfulness) and perhaps as a form of cultural entertainment.