The invention relates to a combustion tool including a quarl block made of refractory material, the quarl block defining a quarl exit and a passage between the entry surface and quarl block, said tool including an injector of oxidizer andor fuel that extends through the passage and opens into the quarl block, and also including a sheath that surrounds the injector in the passage section. The guide member forms the curving conveyance route located on an inner side among the guide members is a rotary body rotatably, which is arranged with no pressing member for pressing the sheet material to the rotary body. An implementation compares a first component image of an image with a first component image of a reference image, compares a second component image of the image with a second component image of the reference image, and determines based on these comparisons whether the first component image of the image includes a blotch. Finally, the initial trench side walls are oxidized to create the tapered shape. The XML documents are verified against a predetermined schema, secured using a cryptographic technique such as a digital signature, and discovereddistributed in flexible, tamper-resistant manners.