Sponging :  disallowed (Read-only view)
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http://purl.org/goodrelations/v1#isListPrice

This boolean attribute indicates whether a Unit Price Specification is a list price (usually a vendor recommendation) or not. "true" indicates it is a list price, "false" indicates it is not. It is safe to assume by default that a Unit Price Specification that lacks this attributes is not list price. DEPRECATED. Use the gr:priceType property instead.