A name or description which identifies a part of the product price that is subject to the relevant tax, for example a product part that may be taxed with a particular tax rate or amount (separately from other components), or a levy added to a product price that is itself subject to tax. Optional, and repeatable to provide parallel descriptive text in multiple languages. The language attribute is optional for a single instance of <PricePartDescription>, but must be included in each instance if <PricePartDescription> is repeated.