The offer price of a product, or of a price component when attached to PriceSpecification and its subtypes. Usage guidelines: Use the priceCurrency property (with ISO 4217 codes e.g. "USD") instead of including ambiguous symbols such as '$' in the value. Use '.' (Unicode 'FULL STOP' (U+002E)) rather than ',' to indicate a decimal point. Avoid using these symbols as a readability separator. Note that both RDFa and Microdata syntax allow the use of a "content=" attribute for publishing simple machine-readable values alongside more human-friendly formatting. Use values from 0123456789 (Unicode 'DIGIT ZERO' (U+0030) to 'DIGIT NINE' (U+0039)) rather than superficially similiar Unicode symbols.