material constant
material [Expects: https://schema.org/Product, https://schema.org/Text, https://schema.org/URL]
A material that something is made from, e.g. leather, wool, cotton, paper.
Can be used on: https://schema.org/CreativeWork, https://schema.org/Product
Implementation
static const material = IriTerm.prevalidated('https://schema.org/material');