array',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'post_types'     => array(
					'description' => __( 'An array of post types that the pattern is restricted to be used with.' ),
					'type'        => 'array',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'template_types' => array(
					'description' => __( 'An array of template types where the pattern fits.' ),
					'type'        => 'array',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'source'         => array(
					'description' => __( 'Where the pattern comes from e.g. core' ),
					'type'        => 'string',
					'readonly'    => true,
					'context'     => array( 'view', 'edit', 'embed' ),
					'enum'        => array(
						'core',
						'plugin',
						'theme',
						'pattern-directory/core',
						'pattern-directory/theme',
						'pattern-directory/featured',
					),
				),
			),
		);

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}
}