| http://www.w3.org/ns/prov#value | - Especially in lists of different sites, or where there is a high percentage of the screen covered with content such as text (which can be detected using normal methods), it would often be obtrusive to generate the explanatory text as a ???permanent??? overlay on the display screen, that is, a display field that obscures the unmarked display but that the user cannot easily eliminate in order to be
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