| http://www.w3.org/ns/prov#value | - Similarly, these markers may be formed of material (e.g., metals or alloys such as stainless steel, beryllium, or Nitinol) which is partially internally reflective of the energy form so as to give rise to an artifact (e.g., a streak or ray) which appears to emanate from in one or more directions from the exact location of the marker.
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