VercatusSale prices with accurate validity conditions
Google's merchant listing documentation gives sale prices an explicit validity window in ISO 8601: validFrom for the start and validThrough or priceValidUntil for the end, both placeable on the Offer, while on a PriceSpecification only validFrom and validThrough apply (priceValidUntil is not applicable there). It recommends giving both start and end, with time and timezone, and warns that a listing may not display if priceValidUntil indicates a past date.
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AGrade A: official documentation or a standard. A grade describes the provenance of the sources above; it is not a probability that a change will work. The effect basis says how the size of the effect is known: measured by a study, taken from an industry report, only documented without a size, or not quantified.
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