| http://www.w3.org/ns/prov#value | - This embodiment is particularly preferred for a simple ???always-on??? or manually-switched tag, which can be smaller then a tag responsive to a dog-whistle on-command. [0095] Referring now to FIG. 1b, this shows a cross-section through an exemplary tag 10 which, because it may have a relatively small size, is suitable for a small pet such as a cat.
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