| http://www.w3.org/ns/prov#value | - Depending on the working principle of the second metrology arrangement 12, the second reference element may be a reflecting element, e.g. a reflective surface or an element providing a plurality of reflecting surfaces such as a so called corner cube prism or the like, when an interferometry principle is used, or a diffractive element, e.g. a grating, when an encoder principle is used.
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