| http://www.w3.org/ns/prov#value | - However, the mark to be superimposed is not limited to the boxed mark X. For example, various symbols such as arrows ???, X, ???, and the like or icons and the like may be used, and any other marks may be used as long as the user can visually confirm the image coordinate position of the marker specified by the image coordinate acquisition unit 5112.
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