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<?php
namespace Yoast\WP\SEO\Generators\Schema;
use Yoast\WP\SEO\Context\Meta_Tags_Context;
use Yoast\WP\SEO\Surfaces\Helpers_Surface;
/**
* Class Abstract_Schema_Piece.
*/
abstract class Abstract_Schema_Piece {
/**
* The meta tags context.
*
* @var Meta_Tags_Context
*/
public $context;
/**
* The helpers surface
*
* @var Helpers_Surface
*/
public $helpers;
/**
* Optional identifier for this schema piece.
*
* Used in the `Schema_Generator::filter_graph_pieces_to_generate()` method.
*
* @var string
*/
public $identifier;
/**
* Generates the schema piece.
*
* @return mixed
*/
abstract public function generate();
/**
* Determines whether the schema piece is needed.
*
* @return bool
*/
abstract public function is_needed();
}