Use ‘Artifact’ for icons, etc., that do not represent meaningful content. Artifacts are “graphics objects that are not part of the author’s original content but rather are generated by the conforming writer in the course of pagination, layout, or other strictly mechanical processes.”[]

	Note
	NOTE: Artifacts may also be used to describe areas of the document where the author uses a graphical background, with the goal of enhancing the visual experience. In such a case, the background is not required for understanding the content. [PDF2.0]

Use ‘NonStruct’ for any additional FOs that are necessary only to generate the correct visual appearance of a note, etc. A ‘NonStruct’ Structural Element is not interpreted or exported to other document formats but its descendants are processed normally.