| http://www.w3.org/ns/prov#value | - The image data supplied from the image data supply means can be obtained in a variety of ways such as from, for example, (i) map data stored on a portable map data holding means as in diskettes or CD's, and/or (ii) map cartridges or cards (with the image data supply means preferably having associated read/write means), and/or (iii) a more permanent (albeit read-writable) memory storage means (e.g.
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