material

e.g. Oil, Watercolour, Acrylic, Linoprint, Marble, Cyanotype, Digital, Lithograph, DryPoint, Intaglio, Pastel, Woodcut, Pencil, Mixed Media, etc.

Values expected to be one of these types
`Text` `URL`

Used on these types
`VisualArtwork`

schema: http://schema.org/

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Code Version 1.1